Hygronemobius amoenus Chopard, 1920

Hygronemobius amoenus Chopard, 1920 View in CoL

( Figs. 13–18 View FIGURE 13 View FIGURE 14 View FIGURE 15 View FIGURE 16 View FIGURE 17 View FIGURE 18 , Map 1)

Hygronemobius amoenus Chopard, 1920: 120 View in CoL . Holotype: male, FRENCH GUIANA, Saint-Laurent-du-Maroni, St. Jean de Maroni. Depositoy : Museum National d‘Histoire Naturelle, Paris (MNHN).

Hygronemobius amoenus View in CoL : Chopard, 1967: 189.

Hygronemobius amoenus View in CoL : Desutter-Grandcolas, 1993: 12.

Hygronemobius amoenus View in CoL : Pereira, Miyoshi, Martins, Fernandes, Sperber & Mesa, 2013: 1, 3, 16, 17, 18.

Examined material: 10 males and 10 females. Brasil [ Brazil], Pará, Melgaço, FLONA Caxiuanã , ECFPnESECAFLOR; 1°43'35"S, 51°26'36"W; I.2012; D.A. Cunha leg GoogleMaps . 3 males and 7 females. Same data as the previous, but II.2012 ( MPEG) GoogleMaps . 18 males and 16 females. Same data as the previous, but month and year collection unknown ( MPEG) GoogleMaps . 1 male. Same data as the previous, but month unknown and collected in 2012 ( MPEG) GoogleMaps . 4 males and 5 females. Same data as the previous, but I.2012 ( MPEG) GoogleMaps . 5 males and 12 females. Same data as the previous, but II.2012 GoogleMaps . 7 males and 7 females. Same data as the previous, but III.2012 ( MPEG) GoogleMaps . 4 males and 1 female. Same data as the previous, but IV.2012 ( MPEG) GoogleMaps . 4 males and 1 females. Same data as the previous, but V.2012 ( MPEG) GoogleMaps . 2 males and 2 females. Same data as the previous, but VI.2012 ( MPEG) GoogleMaps . 5 males and 7 females. Same data as the previous, but VII.2012 ( MPEG) GoogleMaps . 1 male. Same data as the previous, but VII.2011 GoogleMaps . 6 males and 6 females. Same data as the previous, but VIII.2012 ( MPEG) GoogleMaps . 5 males and 4 females. Same data as the previous, but IX.2012 ( INPA) GoogleMaps . 2 males and 2 females. Same data as the previous, but XI.2011 ( BOTU) GoogleMaps . 1 male and 4 females. Same data as the previous, but XII.2011 ( BOTU) GoogleMaps .

Updated diagnosis: Similar to other species of the amoenus group (except Hygronemobius torquatus Desutter-Grandcolas, 1993 ), the male exhibits two longitudinal whitish stripes on the pronotum; however, it is distinguishable from other species in the group by the following characteristics: the lighter color of head and pronotum ( Figs. 13D–E View FIGURE 13 ; 14A, C View FIGURE 14 ), the reticulate spots in the area below the insertion of the antennae, genae, and clypeus ( Fig. 13E View FIGURE 13 ); the whitish stripes surrounding the eyes ( Figs. 13D–E View FIGURE 13 ); the additional whitish mark along the posterior margin of pronotal disc, sometimes forming a transverse stripe ( Figs. 13B View FIGURE 13 ; 14A View FIGURE 14 ); the abdomen uniformly blackish or darkbrownish, except the supra-anal plate and the fourth tergite, which are partially whitish ( Figs. 13B View FIGURE 13 ; 16G View FIGURE 16 ; 18B, G View FIGURE 18 )—in males, the fourth tergite with intercalated whitish spots, two on the sides and one in the middle ( Fig.13B View FIGURE 13 ), and in females, the fourth tergite is almost entirely whitish ( Fig. 18B View FIGURE 18 ).

Redescription. Head. Coloration light brown, with a slightly lighter stripe extending along the inner margin of the eyes, from the dorsal portion to the inner margin of the antennal orbits, contiguous with a medial spot of the same tone, extending to the clypeal suture. Reticulated spots formed by dark brown punctuations extend laterally from the gena to the apex of the clypeus. Labrum lighter than the cephalic capsule ( Fig. 13E View FIGURE 13 ). In frontal view, triangular, wider than tall, with prominent eyes and the antennal orbit close to the base of the eyes. Medial ocellus at the same level as the upper margin of the antennal orbits and marked with a black spot. Lateral ocelli near the end of the coronal branch of the ecdysal line ( Fig 13E View FIGURE 13 ). In lateral view, eyes oval, taller than wide. Posterior portion of the gena and the postocular region glabrous, lighter than the rest of the cephalic capsule ( Fig. 13D View FIGURE 13 ). First two segments of the maxillary palpomeres similar, almost equal in length, cylindrical, yellowish in color with white distal portions; third palpomeres longer than the sum of the previous two, subcylindrical, narrower proximally and lighter; fourth conical, smaller and slightly darker than the third; fifth conical, rounded distally, longer than any previous segment, and brown in color, except for the whitish tip ( Fig. 13F View FIGURE 13 ).

Thorax. Pronotum, in dorsal view, wider than long, with almost straight anterior and posterior margins ( Fig. 14A View FIGURE 14 ). Pronotal disc brown, with two lateral whitish stripes and an additional mid spot (sometimes forming a stripe) on the posterior margin, and ecdysal line conspicuously marked ( Fig. 14A View FIGURE 14 ). AS formed by three almost parallel macrochaetae, two in the brown portion of the disc and one in the whitish stripe; MSG formed by three macrochaetae forming a square angle; PS formed by seven macrochaetae, four of them forming an arch, followed by three more lateral macrochaetae forming an almost straight line, extending through the lateral lobes ( Figs. 14A–B View FIGURE 14 ). In lateral view, lateral lobes longer than tall and completely brown ( Figs. 13B View FIGURE 13 ; 14C View FIGURE 14 ). LS formed by six macrochaetae, forming the pattern seen in Figs 14D View FIGURE 14 . Prosternum reduced; mesosternum rectangular, with rounded corners and slightly darker anterior portion; and metasternum hexagonal, with slightly darkened anterior edges ( Fig. 13G View FIGURE 13 ). Mesosternum and metasternum setose ( Fig. 13G View FIGURE 13 ).

Wings. Tegmina longer than wide, light brown in color with whitish spots in the anal, postcubital, and harp regions, and at the distal portion. These spots extend from the cubital-anal region, radiating throughout the length along the medial + cubital-anal veins. The An+PCup veins well visible ( Fig 15A View FIGURE 15 ). First and second C+Sc veins connected proximally, as well as the third and fourth C+Sc veins ( Fig. 15B View FIGURE 15 , white circles). Stridulatory apparatus with 44 teeth (N=1, Fig. 15C View FIGURE 15 ).

Legs predominantly ochre, with conspicuous setae (macrosetae), and pubescent surface covered with small setae ( Figs. 16A–F View FIGURE 16 ). Dorsal surface of fore and mid femora with the mid-distal portion brown and a whitish spot in the middle. Dorsal surface of hind femora almost completely brown, except for the two whitish spots and the ochre distal portion. All basitarsi predominantly whitish ( Figs. 16A–F View FIGURE 16 ). Tympana present only on the outer surface of the fore tibia ( Fig. 16A View FIGURE 16 ). Hind legs robust, with three dorsal spurs on each margin, two apical on the inner margin, and three on the outer margin ( Figs. 16E–F View FIGURE 16 ).

Abdomen, in dorsal view, uniformly black or dark brown, except for the supra-anal plate’s proximal half and the fourth tergite, which are partially whitish ( Figs. 13B View FIGURE 13 ; 16G View FIGURE 16 )—fourth tergite with small and intercalated whitish spots, two on the sides and one in the middle ( Fig.13B View FIGURE 13 ). Supra-anal plate small, conical, with a rounded posterior margin ( Fig. 16G View FIGURE 16 ). Abdominal sternites predominantly brown ( Fig. 13C View FIGURE 13 ). In ventral view, subgenital plate wider than long, with a widely rounded posterior margin and a slightly lighter mid-distal spot ( Fig. 16H View FIGURE 16 ); in lateral view, longer than tall ( Fig. 16I View FIGURE 16 ). Cerci of lighter color near their base.

Phallic complex. Pseudepiphallic apical lobes triangular and acute, completely membranous, covered with bristles, and conspicuously distinctive from the pseudepiphallic sclerite and median lobes. In dorsal view ( Fig. 17A View FIGURE 17 ), pseudepiphallic median lobes well-sclerotized, distinctive from the pseudepiphallic sclerite. Ectophallic apodeme thin, and endophallic cavity reduced. Endophallic sclerite with an invagination between the lateral appendages and the central one, although it is almost imperceptible. Endophallic sclerite symmetrical, with central part connected to lateral appendages only distally and medio-proximally separated, lateral appendages triangular. Endophallic apodeme well-sclerotized. In lateral view ( Fig. 17B View FIGURE 17 ), pseudepiphallic parameres as well-sclerotized inward lobes. In axial view ( Fig. 17C View FIGURE 17 ), median pseudepiphallic lobe well-sclerotized. Pseudepiphallic parameres with rounded outer margin and irregular inner margin. Ectophallic fold well-projected ventrally. In lateral view ( Fig. 17D View FIGURE 17 ), pseudepiphallic apical lobes triangular and downcurved. Pseudepiphallic median lobe projected posteriorly. Ectophallic fold well-developed. Rami of medium thickness and well-sclerotized.

Female. Tegmina reduced ( Figs. 18A–B View FIGURE 18 ). Base of the pronotal disc larger than males. Abdominal tergites uniformly dark brown, with the fourth tergite completely whitish ( Fig. 18B View FIGURE 18 ). Ovipositor, in lateral view, almost straight, slightly upcurved ( Fig. 18D View FIGURE 18 ); in dorsal and ventral views, straight, with dorsal valves bearing very small denticulations on the apex ( Figs. 18E–F View FIGURE 18 ). Tenth tergite similar to males ( Fig. 18G View FIGURE 18 ); Subgenital plate ochre; in ventral view, wider than long, with the posterior margin forming two lobes ( Fig. 18I View FIGURE 18 ); in lateral view, longer than tall, with rounded posterior margin ( Fig. 18H View FIGURE 18 ).

Measurements (mm).

Males. TL: 5.9–7.2; PL: 1.1–1.2; PW: 1.2–1.9; Tg: 2.2–3.5; HF: 3.7–4.2; HT: 2.9–3.2.

Females. TL: 5.1–7.2; PL: 1.3–2.0; PW: 1.2–1.9; Tg: 0.5–1.0; HF: 3.8–4.1; HT: 2.2–3.2; Ov: 2.3–2.9.

Distribution. This species was originally recorded in the Northern French Guiana (Chopard, 1920, Desutter-Grandcolas 1993), and this is the first record in Brazil, in the Floresta Nacional de Caxiuanã, in Pará State (Map 1).