taxonID	type	description	language	source
45376A353255B043FF7CF8C82059F866.taxon	description	5 “ As described by Nutting (1900: 75), those of Hippurella annulata, type species of Hippurella, are axillary and by inference unprotected (in being assigned to Antennopsis), while those of H. longicarpa, type species of Antomma, are protected by phylactocarps at the ends of the branches. »	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353254B04CFF7CFD81234FF84E.taxon	description	Figs 1 – 8, 15; Tables 1, 2	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353254B04CFF7CFD81234FF84E.taxon	materials_examined	Type material. National Museum of Natural History, Washington, USA, catalogue number: USNM 72363 (schizoholotype); collected in 1880 from an unknown locality “ off the eastern coast of the United States ” (Fewkes 1881: 127, 129). Material examined. Unbranched morphotype: MNHN-IK- 2015 - 629; Proteus stn DW 5067; 6 ° 12.4 ’ N, 52 ° 04.5 ’ W; 103 – 101 m; 01 Dec 2017; one colony 5 cm high bearing a phylactocarp. — MNHN-IK- 2015 - 631; Proteus stn DW 5076; 6 ° 10.3 ’ N, 51 ° 59.6 ’ W; 112 – 112 m; 02 Dec 2017; one colony, 6 cm high, bearing 2 phylactocarps. — MNHN-IK- 2015 - 625; Proteus stn DW 5078; 6 ° 10.2 ’ N, 52 ° 00.1 ’ W; 105 – 99 m; 02 Dec 2017; 6 colonies, 5 – 7.5 cm high, all but one bearing phylactocarps; GenBank accession numbers: MT 949946 (16 S), MT 949952 (18 S), MT 949940 (28 S), MT 949458 (COI). — MNHN-IK- 2015 - 652; Proteus stn DW 5079; 6 ° 10.1 ’ N, 52 ° 00.3 ’ W; 104 – 101 m; 02 Dec 2017; 4 colonies, 3 – 6 cm high, of which 2 are sterile, while 2 others bear phylactocarps. — MNHN-IK- 2015 - 628; Proteus stn DW 5080; 6 ° 09.9 ’ N, 52 ° 00.1 ’ W; 101 – 100 m; 02 Dec 2017; 2 colonies, one 5.5 cm high and sterile, the other 6.5 cm high and bearing a phylactocarp. — MNHN-IK- 2015 - 653; Proteus stn DW 5086; 6 ° 11.1 ’ N, 52 ° 02.4 ’ W; 107 – 104 m; 02 Dec 2017; 3 colonies, 5.5 – 7.5 cm high, all bearing phylactocarps. — MNHN-IK- 2015 - 617; Proteus stn DW 5087; 6 ° 11.2 ’ N, 52 ° 02.6 ’ W; 105 – 103 m; 02 Dec 2017; 7 colonies, 4 – 8 cm high, with variably developed phylactocarps; GenBank accession numbers: MT 949945 (16 S), MT 949951 (18 S), MT 949939 (28 S), MT 949457 (COI). — MNHN-IK- 2015 - 630; Proteus stn DW 5089; 6 ° 09.5 ’ N, 52 ° 01.4 ’ W; 94 – 92 m; 03 Dec 2017; 2 colonies, each bearing a phylactocarp. — MNHN-IK- 2015 - 635; Proteus stn DW 5091; 6 ° 07.4 ’ N, 51 ° 59.5 ’ W; 89 – 31 m; 03 Dec 2017; a 4.5 cm high colony bearing a young phylactocarp. — MNHN-IK- 2015 - 634; Proteus stn DW 5093; 6 ° 05.4 ’ N, 52 ° 01.5 ’ W; 75 – 76 m; 03 Dec 2017; a 6.5 cm high colony bearing a young phylactocarp. Branched morphotype: MNHN-IK- 2015 - 632; Proteus stn DW 5069; 6 ° 13.6 ’ N, 52 ° 05.3 ’ W; 115 – 115 m; 01 Dec 2017; a ca. 22 cm high colony with phylactocarps; GenBank accession numbers: MT 949950 (16 S), MT 949956 (18 S), MT 949944 (28 S), MT 949459 (COI).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353254B04CFF7CFD81234FF84E.taxon	description	Description. The species displays two distinct morphotypes: one forming simple plumes (Fig. 2) and one building comparatively taller colonies whose stems are provided with irregularly-arranged cladia-bearing branches (Fig. 6). Due to their different appearance and structure, they are described separately below. Unbranched colonies solitary, erect, up to 8 cm high, relatively rigid (quite able to support themselves when out of liquid), feather-like, arising from a tangled mass of thin, highly-ramified, stolonal tubes embedded in sand. Stems simple, moderately-fascicled, not exceeding 0.75 mm in width basally, composed of a centrally-placed, cladia-bearing, main tube, surrounded by a varied number of auxiliary tubes. Main tube relatively thick and unsegmented, with rather thick, smooth perisarc; equivalents of internodes moderately-long, bearing a latero-distal apophysis supporting a cladium; apophysis not always distinctly delimited from the corresponding cladium but, when present, node oblique; apophysis well-developed, with a distally-placed, conical mamelon (with circular aperture on summit) on adaxial surface, and a pair of axillar nematothecae, one on each lateral side. Auxiliary tubes equally undivided, with two parallel, longitudinal rows of nematothecae, arranged either in pairs or irregularly alternate. Cladia unbranched, alternate, closely-set, in two parallel, coplanar rows; up to 12 mm long, regularly divided by distinct, slightly oblique nodes into up to 30 cormidia; each internode relatively long, with a hydrotheca almost centrally-placed, although closest to the proximal node and not occupying the whole length of the cormidium, and its complement of 3 nematothecae, one mesial and a pair of laterals; proximal-most cormidium occasionally with twin mesial nematothecae. Hydrotheca inverted-conical, rather deep, abaxial wall straight to imperceptibly convex, with thickened perisarc, latero-adaxial wall equally thickened and consequently opaque, slightly concave; a perisarc plug at junction between the base and the adaxial wall; hydropore rounded, set close to the abaxial wall; hydrothecal aperture semicircular (in apical view), set at a right angle to the internode. Mesial nematotheca seated well below the hydrothecal base on an adaxial prominence of the internode wall; lateral nematothecae borne on indistinct apophyses, slightly below the hydrothecal rim. Each cladial internode with a number of incomplete internal ridges of perisarc originating adaxially: two flanking above and below the mesial nematotheca, one radiating from the perisarc plug prolonging abaxially the hydrothecal base, one occasionally present in middle of the adaxial hydrothecal wall, two flanking above and below the lateral nematothecae, as well as one (occasionally two) close to the distal node. Phylactocarps up to 3 to each cormoid, given off on one side (that becomes frontal) of the colony from a thick, internal, auxiliary tube that surfaces from inside the fascicled stem at an angle of about 35 – 40 °; up to 19 mm long, borne on a short, smooth pedicel prolonged distally into the longitudinal axis proper; the latter unsegmented, bearing up to 44 stacked verticils, each of which is composed of 3 ramuli (with the exception of the first, occasionally second, whorl) forming an angle of 120 ° between them; ramuli from every other verticil arranged in the same position, while those belonging to consecutive verticils alternate in position; ramuli hollow tubes, antler-shaped, divided dichotomously twice, occasionally showing an incipient third division, distally opening into small, circular apertures; pedicel of phylactocarp with 2 – 4 pairs of nematothecae on adaxial side, remainder of axis athecate; adaxial side of undivided, proximal part of ramulus with a pair of proximal nematothecae, followed by a broadly triangular, raised area of thinner perisarc on which are borne ca. 3 – 4 gonothecae (at different developmental stages), and ending more distally into two successive pairs of nematothecae; first order branches of ramulus with 1 – 2 pairs of nematothecae displaced laterally; second order branches of ramulus with a number of irregularly-placed nematothecae, with a tendency to alternate. Proximal-most whorl of ramuli generally composed of only two latero-abaxial ramuli; occasionally, there may be an unpaired, abaxial ramulus, followed by a pair, and then by regular, alternating rows of three. Gonothecae broadly ovoid, somehow laterally flattened, thin-walled, aperture distal, transversely-set, ovoid in outline, closed by flimsy, deciduous operculum; the type of gonophore could not be ascertained in this fixed material. All nematothecae of a colony trumpet-shaped, movable, bithalamic, with tall lower chamber and shallow upper chamber, the adaxial wall of the latter with distinct emargination. Hydranths contracted inside their corresponding hydrothecae; tentacle number could not be ascertained. Branched colony erect, ca. 22 cm high, rather flaccid, unable to fully support itself when out of liquid, arising from a large mass of enmeshing, thin, ramified fibers embedded in sand. Stem 1 mm wide basally, fascicled, grading to monosiphonic distally; lower half without branches and / or cladia, upper half cladiate, giving rise to 5 irregularly-arranged branches springing in all directions; branches up to 3.5 cm long, given off out- and slightly upward, then arching gracefully nearly horizontally; proximally lightly fascicled, grading to monosiphonic distally. Main tube of stem and branches undivided; equivalents of stem internodes with a latero-distal apophysis supporting a cladium, and 1 – 2 nematothecae in central part of the opposite side, towards the middle of the internode; apophyses well-developed, with a conspicuous, conical mamelon (with small, rounded aperture on summit) on adaxial side, a pair of axillar nematothecae (one on each side of apophysis), as well as with twin, distally-placed, adaxial nematothecae, just below the slightly oblique node that separates the apophysis from the corresponding hydrocladium; internodes of cladia-bearing branches comparatively shorter than their cauline counterparts, without proximal nematothecae, but with similar cladial apophyses, the latter however not delimited distally, but confluent with the corresponding cladia. The latter alternate, the two rows coplanar on both stem and branches; up to 5 mm long on stem and 7 mm long on branches; divided homomerously into up to 16 regular internodes through distinct, slightly oblique nodes; internodes moderately long, with a hydrotheca placed centrally, and its complement of 3 nematothecae, one mesial and a couple of laterals; there are 5 internal septa to each internode, of which 2 pairs flank below and above the nematothecae, while the last one is placed towards the distal node. Hydrotheca deep, conical, abaxial wall almost straight for nearly its whole length, basally convex; adaxial wall distinctly thickened, displaying a wide flange of gradually thinner perisarc on each side of the theca; aperture distinctly sloping adaxially, rim even. Mesial nematotheca well below the hydrothecal base, seated on a distinct, proximal, adaxial prominence of the internode; lateral nematothecae borne on small, though distinct apophyses given off at the junction of the lateral hydrothecal wall with the internode behind; lateral nematothecae greatly surpassing the hydrothecal rim. Hydranths contracted inside their hydrothecae, type of tentacles and their number could not be ascertained. {Fig. 7 about here} Gonosome forming phylactocarps on the distal parts of the branches; phylactocarps arising from either the accessory tubes or the cladia-bearing tube, but given off amongst the hydrocladia in a plane perpendicular to theirs, and projecting upward; proximal most phylactocarps all aligned along a median row but, more distally, alternately shifted on to each side, occasionally forming divergent pairs; phylactocarps short, tubular, arching upward from the axis of cladia-bearing branch, but not being demarcated basally from it by a node; composed of a proximal (axillar) pair of nematothecae (one to each side), followed immediately by 2 consecutive pairs of foramina (for the insertion of gonothecae), another pair of nematothecae towards the central part, and a distal hydrotheca, together with its complement of 3 nematothecae. Gonothecae urn-shaped, thin-walled, except below the aperture, tapering below into an indistinct, laterally-set pedicel; aperture circular, operculum not seen; type of gonophore and sex could not be ascertained. All the nematothecae of the colony alike; conical, moderatelylong, bithalamic, lower chamber deep, upper chamber relatively shallow, with rim emarginated of adaxial side.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353254B04CFF7CFD81234FF84E.taxon	discussion	Remarks. Nutting (1900) supplemented the original account on C. gracilis with a redescription of the type material, a text that was reproduced later on by Fraser (1944). Although many details of its microscopical anatomy remained overlooked, Nutting confirmed the polysiphonic structure of the stem. As noted in the descriptive section, two morphotypes occur in the present collection, one being a typical Callicarpa, sensu Fewkes (1881), while the other has an Antomma - like appearance; they can be easily mistaken for two distinct species, although the results of the molecular study (see below) demonstrate that both are conspecific. In the unbranched colonies, the phylactocarps “ resemble spikes of barley ” (Fewkes 1881: 135) and, unlike in the type material in which there were “ no hydrothecae on the ribs or at the base of the verticils ”, the proximal most ramuli do not always comprise exclusively the usual branched, hollow, nematothecate tubes. Indeed, a ramulus can be replaced by a short, either simple (MNHN-IK- 2015 - 629) or bifid (MNHN-IK- 2015 - 652), cladium. In this case, the proximal part of the ramulus comprises a short axis, provided basally with 2 laterally-placed, axillar nematothecae (at origin from the longitudinal axis of the phylactocarp), immediately followed by the site of the insertion of gonothecae and – after a short distance – by another pair of nematothecae, all ending in a hydrotheca with its complement of 3 nematothecae. From here, the ramulus is either prolonged by a sequence of hydrothecate internodes (MNHN-IK- 2015 - 629), or by a short, bifid, distal projection above the hydrotheca (each branch is provided with a single, basal nematotheca) carrying a succession of hydrothecate internodes, with or without intervening ahydrothecate internodes bearing single nematothecae (MNHN-IK- 2015 - 652). In some other instances, above the proximal-most hydrotheca, there is a bifid projection (whose short branches do not bear nematothecae) provided with a pair of hollow spikes with nematothecae (MNHN-IK- 2015 - 628). In order to preserve the integrity of these rare specimens, the structures mentioned above were not illustrated. Type material of C. gracilis was represented by a ca. 15 cm high colony, whose proximal part of the stem bore the stump of a potential broken branch (although this could have been well the pedicel of a broken phylactocarp). A comparatively taller, branched colony is present in material MNHN-IK- 2015 - 632. Its trophosome resembles that of Antomma longicarpa (Nutting, 1900), as illustrated by Fewkes (1881, as Hippurella annulata Allman, 1877), in being represented by a stem with pinnately-arranged cladia that gives rise irregularly to a number of cladia-bearing branches, both the stem and its branches being fascicled. Although their respective cladia are almost indistinguishable morphologically, there are several differences occurring in the branched morphotype compared to its unbranched counterpart: 1) the cladial apophyses of the stem possess distally twin nematothecae (Fig. 7 A, B), but their presence is, however, inconstant, although it is not clear whether this is a normal situation or the consequence of a possible mechanical breakage; such nematothecae were never observed in any of the unbranched colonies at hand; 2) the gonosome of the branched morphotype is not represented anymore by a morphologically-complex structure, but by the equivalent of a radial section of it, comprising only single or twin ramuli, that have spread over the distalmost part of the axis of a cladia-bearing branch; 3) this said, it is however not clear whether the specimen at hand displays a fully-developed gonosome or, in other words, if the structures illustrated in Figs 7 K, L and 8 B, C represent incipient phylactocarps or the components of an entire phylactocarp fused to the axis of a cladia-bearing branch; additional fertile specimens are expected to answer the question; 4) each phylactocarp / ramulus represents the equivalent of the proximal-most portion of a ramulus that include hydrothecate internodes, as described in the unbranched colonies. Besides C. gracilis, the genus Callicarpa comprises a second species, C. chazaliei Versluys, 1899, that is distinguished from the former through the following characters: 1) its cladia are comparatively more distant from one another; 2) its hydrocladial internodes possess a distal, unpaired nematotheca above the hydrotheca; 3) the ramuli of its phylactocarps are reportedly branched once instead of twice.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353254B04CFF7CFD81234FF84E.taxon	distribution	Distribution. Callicarpa gracilis, although dealt with in comprehensive works such as Nutting (1900) and Fraser (1944), was only known through the (unlabeled) type material collected by the Blake in 1880 who, according to Fewkes (1881: 127), sailed “ off the eastern coast of the United States, in the summer of 1880 ”. Nutting (1900: 85), however, expressed the opinion that it “ belongs doubtless to the West Indian fauna ”, but this appears to be inexact in light of the data provided by the descriptor. The specimens dealt with in the present study represent the first record for French Guiana.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353259B054FF7CFEE121FBFE4F.taxon	description	Figs 9 – 14, 16; Table 3	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353259B054FF7CFEE121FBFE4F.taxon	materials_examined	Type material. MCZ 2109 for the holotype of A. rigida Allman, 1877 [Calder (1983: 22); registration code not currently listed in the online catalogue; type locality: off Cape Fear, North Carolina, USA, 16 m] and MCZ 252 for specimens of A. trifida L. Agassiz, 1862 from the type locality of Charleston, South Carolina, USA [A. Agassiz (1865: 140); registration code not currently listed in the online catalogue]. Material examined. MNHN-IK- 2015 - 626; Proteus stn DW 5067; 6 ° 12.4 ’ N, 52 ° 04.5 ’ W; 103 – 101 m; 01 Dec 2017; many colonies up to 10 cm high, some with corbulae, both sexes present; GenBank accession numbers: MT 949947 and MT 949948 (16 S), MT 949953 and MT 949954 (18 S), MT 949941 and MT 949942 (28 S). — MNHN-IK- 2015 - 636; Proteus stn DW 5068; 6 ° 13.8 ’ N, 52 ° 05.5 ’ W; 116 – 115 m; 01 Dec 2017; colony composed of a few stems up to 6.5 cm high, some bearing ³ corbulae. — MNHN-IK- 2015 - 627; Proteus stn DW 5069; 6 ° 13.6 ’ N, 52 ° 05.3 ’ W; 115 – 115 m; 01 Dec 2017; a few colonies up to 11 cm high, some with corbulae, both sexes present; GenBank accession numbers: MT 949949 (16 S), MT 949955 (18 S), MT 949943 (28 S). — MNHN-IK- 2015 - 638; Proteus stn DW 5070; 6 ° 15.8 ’ N, 52 ° 06.5 ’ W; 125 – 125 m; 01 Dec 2017; two stems, 7 and 8.5 cm high, tallest bearing ♀ corbulae. — MNHN-IK- 2015 - 637; Proteus stn DW 5074; 6 ° 16.8 ’ N, 52 ° 08.6 ’ W; 132 – 130 m; 01 Dec 2017; three stems, 6 – 7.5 cm high, one bearing ♀ corbulae. — MNHN-IK- 2015 - 640; Proteus stn DW 5085; 6 ° 12.4 ’ N, 52 ° 01.5 ’ W; 149 – 150 m; 02 Dec 2017; a 12 cm high stem bearing ³ corbulae. — MNHN-IK- 2015 - 633; Proteus stn DW 5086; 6 ° 11.1 ’ N, 52 ° 02.4 ’ W; 107 – 104 m; 02 Dec 2017; a few colonies up to 6.5 cm high, some with corbulae, both sexes present. — MNHN-IK- 2015 - 639; Proteus stn DW 5096; 6 ° 10.5 ’ N, 52 ° 02.6 ’ W; 96 – 98 m; 03 Dec 2017; several stems 4 – 10 cm high, tallest bearing ³ corbulae.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353259B054FF7CFEE121FBFE4F.taxon	description	Description. Colonies growing in tangled masses, composed of upright (though rather flaccid) stems, up to 12 cm high, arising from creeping, branched, tortuous hydrorhiza generally firmly attached to barnacle shells. Stems monosiphonic throughout, wiry, slender, composed of proximal, smooth, athecate part of varied length, and an upper, thecate part divided into regular internodes by means of slightly oblique nodes, the latter becoming gradually more distinct distally. Thecate part proximally devoid of cladia, but provided with a row of frontal, saccate nematothecae and / or followed by internodes with atrophied cladial apophyses and nematothecae. Junction between acladiate and cladiate parts of the stem either indistinct, or marked by a deeply incised, strongly oblique node (hinge joint), or comprising a prosegment (delimited at both ends by hinge joints) carrying frontally a saccate nematotheca. Regular internodes of the stem short, with a proximal, frontal, saccate nematotheca, a latero-distal apophysis supporting a cladium, the latter flanked by two saccate nematothecae with gutter-shaped, adaxial apertures; apophysis with a well-developed, latero-frontal, conical mamelon with circular aperture on summit. Young stems unbranched, older stems with up to second order branches; the latter irregularly replacing a hydrocladium; branches given off from front of stem either singly or in alternating pairs from two (rarely three) consecutive internodes of the upper part of main stem; structure similar to that of the main stem. Cladia alternate (the two rows forming an obtuse angle between them), closely-set, up to 12 mm long, composed of a regular succession of up to 35 cormidia separated by well-marked, slightly oblique nodes; cormidium short, accommodating a hydrotheca of the same length, together with its three associated nematothecae: one mesial and a pair of laterals; two intranodal, conspicuous (though incomplete) septa, dividing the internode into three, almost equal parts. Hydrotheca cup-shaped, slightly elongate, lower half of abaxial wall bearing a moderately-long mesial nematotheca, upper half concave, with thickened perisarc; adaxial wall slightly concave, giving rise (from the insertion point of the proximal intranodal septum) laterally to a pair of perisarcal processes running obliquely upwards into the hydrothecal lumen, each forming a globular projection, but not a transverse septum uniting the lateral walls of the hydrotheca between them; aperture slightly sloping, composed of 9 triangular cusps, one abaxial and 4 pairs of lateral, the last pair mostly hidden by the lateral nematothecae; mesial nematotheca reaching half-length the hydrotheca, aperture gutter-shaped, opened adaxially all the way long; lateral nematothecae saccate, imperceptibly projecting above the hydrothecal rim, apertures gutter-shaped on adaxial side. Hydranths contracted within their corresponding hydrothecae; tentacles filiform, their number could not be ascertained. Colonies dioecious; male and female gonophores formed inside ovoid gonothecae with flimsy perisarc, protected together by elongate corbulae, the latter replacing irregularly a cladium, either singly or in alternate, consecutive pairs; a normal cormidium at the base of each corbula. Male corbulae cylindrical, up to 5 mm long, open, composed of up to 15 regular ribs per side, arranged alternately along a straight rachis; a nematotheca in the distal axil at the insertion of each rib on the axis; ribs free, curving above the gonothecae, occasionally fused punctually at their tips and / or at some sites where they touch each other laterally; ribs triangular in general outline, each free side with a row of 9 – 10 nematothecae. Female corbulae arched in overall outline, up to 3.5 mm long, closed, composed of up to 14 regular ribs, except for the proximal most pair that are distinct; regular ribs arranged alternately along the corbula axis, with a distal, axillar nematotheca at their basal insertion; each rib asymmetrical, proximal half sheet-shaped, distal half set with a row of 12 – 14 nematothecae; the junction between adjacent ribs takes place along a continuous line at the base of the row of nematothecae; proximal-most ribs forming a pair fused basally together, one rib being free from the corbula (except for its origin on the axis), while the other is fused in its center to the first regular rib of the corbula; these ribs are bilaterally symmetrical, and bear a row of 7 – 10 nematothecae on each free side; all the nematothecae of the corbula saccate, with adaxial, gutter-shaped apertures. Female gonothecae similar in shape to their male counterparts. The development of the zygote takes place within the female gonotheca, and up to 1 mm long, worm-like planulae are released from the female corbula through a passage between the proximal-most, unpaired rib and the couple of first regular ribs.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353259B054FF7CFEE121FBFE4F.taxon	discussion	Remarks. Calder (1983, 2013) and Ansín Agis et al. (2001) discussed the nomenclature of this species. Calder (1983) confirmed the so far accepted synonymy (see Fraser 1944: 393), stating that “ There is nothing in the original description of Aglaophenia rigida by Allman (1877), or in subsequent descriptions of that species by later authors, that can be used to distinguish it from A. trifida ”. Of noteworthy importance, Calder’s material was essentially topotypic with McCrady’s A. cristata (D. Calder, pers. comm.). The syntype of A. rigida was reexamined subsequently by Ansín Agis et al. (2001), as well. The original description given by McCrady (1859, as A. cristata) is imperfect (e. g. the number of hydrothecal cusps is given as “ eight or ten (?) ”), the morphological terminology is inadequate, and there are no illustrations, making the species unrecognizable on microscopical grounds. However, a few macroscopic traits highlight its general morphology, e. g. “ Main stems […] giving of, on their upper half, two or three pairs of opposite branches, and growing together in a bushy cluster […] ”, and “ The main stems are of a yellowish, horny brown, the branchlets lighter in color, and the tips of the branchlets have a vivid, somewhat golden yellow color ” (McCrady 1859: 202, 203). Nutting (1900: 91, 105) gave a comparatively more modern and clearer description based on McCrady’s account as, at the date of publication of his monograph, he was “ unable to secure either specimens or figures of this species ” (Nutting 1900: 106). Colonies may reportedly reach as much as 24 inches (61 cm) (Nutting 1900: 91, as A. rigida). Although recognized as “ the most abundant Aglaophenia on our [USA] Atlantic seaboard ”, Nutting gave a short account on the “ closed ” corbula only, not stipulating that a morphologically distinct structure is build up by the opposite sex, as documented in the present study. Similarly, Allman (1877) documented only “ completely closed ” corbulae in specimens assigned to his newly-described A. rigida, as equally did Vannucci (1950, as A. rigida) and Calder (1983). Several species of Aglaophenia have corbulae resembling those of A. trifida and, among those thoroughly described, those of A. lophocarpa Allman, 1877 and A. tubulifera (Hincks, 1861) could be mentioned (Svoboda 1992; Ansín Agís et al. 2001). As noted by Calder (2013), it is unlikely that this hydroid could have occurred on floating Sargassum, as stated by Fraser (1912, as A. rigida), but the dredged specimens epizoic on sponge may, indeed, belong to the present species. Similarly, the Pacific material dealt with by Fraser (1938 a, b, 1939, 1948, as A. rigida) may not belong, either, to the species dealt with herein.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353259B054FF7CFEE121FBFE4F.taxon	distribution	Distribution. From North Carolina, USA, to Brazil, including the Gulf of Mexico and the Caribbean Sea (Calder 2013). This is the first record from French Guiana (present study).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A35324AB05CFF7CFEC52392FC33.taxon	description	Fig. A 1 Antennopsis hippuris Allman, 1877: 35, pl. 21 figs 3 – 6 (type species of the genus Antennopsis Allman, 1877). — Fewkes, 1881: 128. — Nutting, 1900: 73, pl. 11 figs 4 – 6. — Fraser, 1944: 319, pl. 67 fig. 305. Nemertesia hippuris — Ramil & Vervoort, 2006: 122. Description. Small and rather delicate colonies, not surpassing 2 inches (ca. 5 cm) in height, arising from a cluster of tubular, stolonal fibers; stems simple, straight, monosiphonic, divided into rather short internodes, each bearing distally a conspicuous cladial apophysis; a couple of axillar nematothecae, and one below the apophysis; the latter are given off irregularly from all sides of the stem; cladia slender, heteromerously divided into hydrothecate and ahydrothecate internodes; the former with one hydrotheca and 4 nematothecae: one mesial, a couple of laterals, and one above the hydrotheca; ahydrothecate internodes with 2 nematothecae in a row; hydrothecae borne on proximal halves of their corresponding internodes, small, rather deep, cup-shaped, margin entire, not everted; colonies dioecious; gonothecae shortly pedunculate, borne singly in the axils of hydrocladia; presumably male elongated oval, with an oblique terminal orifice; presumably female slipper-shaped with the distal end curved over to one side, and with a subterminal orifice.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A35324AB05CFF7CFEC52392FC33.taxon	distribution	Distribution. Off Double-Headed Shot Cays (23 ° 59 ’ 50 ’’ N, 80 ° 19 ’ 15 ’’ W, 356 m), Florida Straits; off Charleston, South Carolina (32 ° 7 ’ N, 78 ° 37 ’ W, 419 m); off St. Augustine, Florida (29 ° 47 ’ N, 80 ° 06 ’ W, 481 m) [summarized by Nutting (1900)].	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353249B05FFF7CFF5122FFF847.taxon	description	Fig. A 2	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353249B05FFF7CFF5122FFF847.taxon	description	Description. Colonies up to 15 cm high, arising from a dense bundle of tubular filaments; stem fascicled throughout, giving rise to monosiphonic, (sub) opposite to alternate side branches, pinnately-set proximally, irregularly arranged distally around the stem; branches divided into rather long internodes, each bearing a nematotheca proximally, and a latero-distal cladial apophysis; axil with conical mamelon and a pair of axillar nematothecae; cladia alternate on the side branches; set in one plane proximally, but surrounding the branches on all sides distally and, there, either scattered or regularly verticillate; heteromerously divided into alternating long, hydrothecate and short, ahydrothecate internodes; two intranodal septa, one proximal, the other distal; hydrothecate internodes with a hydrotheca and its complement of 3 nematothecae, one mesial and a pair of laterals; hydrothecae deep, thimble-shaped, with slightly everted margin, rim even; ahydrothecate internodes with single nematothecae; gonothecae arising singly from the axils of hydrocladia, fusiform, with a somewhat bottle-shaped neck.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353249B05FFF7CFF5122FFF847.taxon	discussion	Remarks. Type material was destitute of a gonosome, but Nutting (1900) found a fertile specimen “ among the Albatross material from the West Indies ”.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353249B05FFF7CFF5122FFF847.taxon	distribution	Distribution. Off Pacific Reef, Florida (ca. 25 ° 22 ’ N, 80 ° 08 ’ W, 517 m); off Charleston, South Carolina (32 ° 7 ’ N, 78 ° 37 ’ W, 419 m); off Beaufort, North Carolina (34 ° 39 ’ N, 75 ° 33 ’ W, 195 m) [summarized by Nutting (1900)]. FIGURE A 2. Hippurella annulata Allman, 1877. A. Whole colony. B. Portion of stem with proximal parts of two consecutive hydrocladia. C. Cladial apophysis. D. Portion of cladium. E. Detail of a hydrotheca. F. Distal part of a branch with gonothecae. Modified after Allman (1877) (A, B), Fewkes (1881, as Antennopsis ramosa) (C), and Nutting (1900, as Antennopsis annulata) (D – F).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353248B05EFF7CFF512660FCE1.taxon	description	Fig. A 3	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353248B05EFF7CFF512660FCE1.taxon	description	Description. No complete colonies are known, but their stems are likely unbranched and fascicled. Main stem unsegmented, bearing alternate cladia; a nematotheca near the origin of each cladium. Cladia rather spaced from one another, up to 14.5 mm long, homomerously divided into moderately-long internodes; the latter with a nearly centrally-placed hydrotheca, its complement of three nematothecae (one mesial and a pair of laterals), as well as a distal nematotheca above the hydrotheca; internodes with internal ridges given off adaxially: one proximal and one distal, as well as two additional pairs, one flanking the mesial nematotheca above and below, and the second the lateral nematothecae, equally above and below. Hydrothecae rather deep, inverted-conical, abaxial wall straight or nearly so, adaxial wall slightly concave, aperture set perpendicularly to the length of internode, rim even. Nematothecae movable, elongate, bithalamic, wall of upper chamber emarginated adaxially; mesial nematotheca seated on an adaxial prominence of the internode; lateral nematothecae borne on inconspicuous apophyses. Phylactocarps given off in a plane outside that formed by the two rows of cladia; up to ca. 6 mm long, bearing 10 stacked whorls of verticillate ramuli; each whorl composed of 3 ramuli divided dichotomously once; main trunk with 2 successive pairs of opposite nematothecae, branches with 2 alternate rows of nematothecae.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353248B05EFF7CFF512660FCE1.taxon	discussion	Remarks. Proximal-most portions of phylactocarps occasionally bearing a cladium.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353248B05EFF7CFF512660FCE1.taxon	distribution	Distribution. Off the Dry Tortugas (ca. 24 ° 37 ’ N, 82 ° 55 ’ W, 45 m), Florida, USA (Versluys 1899) and off Margarita Island (ca. 11 ° N, 64 ° W, 31 – 40 m), Nueva Esparta, Venezuela (Fraser 1947).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353277B061FF7CFF51217DFCE1.taxon	description	Fig. A 4	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353277B061FF7CFF51217DFCE1.taxon	description	Description. Colonies up to 35 cm high, with fascicled stems, whose lower half is devoid of branches and hydrocladia; upper half bearing long, slender branches, given off either singly or, commonly, in nearly opposite pairs; branches arising in all direction around the stem; stem and branches with indistinct divisions; equivalents of internodes with a proximal nematotheca, a latero-distal cladial apophysis with 2 nematothecae, as well as an additional nematotheca below; cladia given off at an angle of ca. 60 °, arranged regularly alternately along the branches; homomerously (?) divided into long internodes, each with a proximal hydrotheca and its complement of 3 nematothecae (one mesial and a couple of laterals), as well as a distal nematotheca, above the hydrotheca; hydrothecae deep, tubular, abaxial walls slightly sinuated, margins entire; gonosome on distal portions of some branches; composed of staked whorls of up to 8 rows of 6 slender, distally tapering, unbranched, nematothecate ramuli, curving out- and upward from the common rachis; gonothecae elliptical, smooth-walled, borne singly or in pairs on the axils of ramuli.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353277B061FF7CFF51217DFCE1.taxon	discussion	Remarks. Antomma elegans was distinguished from A. longicarpa through the “ hydrocladial internodes without septa ” (Fraser 1944) and, consequently, its relationships to the latter remain obscure, pending the reexamination of the type, Fraser’s illustrations being qualitatively poor to sufficiently highlight its specific differences.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353277B061FF7CFF51217DFCE1.taxon	distribution	Distribution. Off Puerto Rico (18 ° 31 ’ 30 ’’ N, 66 ° 18 ’ 20 ’’ W, depth not recorded; 18 ° 24 ’ 45 ’’ N, 67 ° 14 ’ 15 ’’ W, 146 – 329 m; 18 ° 13 ’ 15 ’’ N, 65 ° 56 ’ 45 ’’ W, 439 m) (Fraser 1937).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353276B063FF7CFF5122C3FDA0.taxon	description	Fig. A 5 Hippurella annulata — Fewkes, 1881: 134, pl. 1 fig. 1, pl. 2 figs 4, 5, 8 (non Hippurella annulata Allman, 1877). Hippurella longicarpa Nutting, 1900: 84, pl. 17 figs 1 – 3 [new name for Hippurella annulata sensu Fewkes (1881)]. — Fraser, 1944: 333, pl. 71 fig. 322. — Calder, 2004: 18. Antomma longicarpa — Stechow, 1919: 852. — Stechow, 1920: 35. — Stechow, 1923: 231. Description. Colony up to 23 cm high, stem fascicled, bearing on its distal third a series of opposite to alternate side branches that are given off in all directions; condition of the branches not stated; both stem and branches set with alternately-arranged cladia, more distant on stem than on branches; hydrocladia alternate, divided homomerously into long internodes, each with 7 – 8 intranodal septa, a proximally-set hydrotheca and its complement of 3 nematothecae (one mesial and a pair of laterals), as well as another nematotheca distal on the internode; hydrotheca deep, conical, aperture circular, rim even; distal parts of branches abruptly modified into phylactocarps, composed of stacked verticils of 6 unbranched ramuli; between the bases of adjacent ramuli, there is a nematotheca; a pair of additional nematothecae occurs more distally, where the ramulus, originally given off perpendicularly to the gonosomal axis adopts a vertical posture; finally, a row of nematothecae occur all the way long to their tips; gonothecae quite small, orbicular, arising from the axils of ramuli.	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
45376A353276B063FF7CFF5122C3FDA0.taxon	distribution	Distribution. Off St. Vincent Island (13 ° 15 ’ N, 61 ° 12 ’ W, 227 m), St. Vincent and the Grenadines (Fewkes 1881).	en	Galea, Horia R., Di Camillo, Cristina G., Maggioni, Davide (2021): An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana. Zootaxa 4926 (3): 301-341, DOI: 10.11646/zootaxa.4926.3.1
