Seira antonioi, Cipola & Bellini, 2025

Seira antonioi sp. nov. Cipola & Bellini

Figs 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 , 11 View FIGURE 11 , Table 1 View TABLE 1

Diagnosis. Body whitish anteriorly (except antennae) and yellowish posteriorly (except furcula), with dark navy-blue pigments distally on the ventral plate of the Abd IV and distal and proximal regions of femur I–III ( Fig. 2 View FIGURE 2 ); Ant IV not annulated with an apical bulb bilobed; Ant II–I respectively with 5 and 1 dorsal mac, respectively ( Fig. 3B View FIGURE 3 ); labral papillae conical and subequal ( Fig. 3C View FIGURE 3 ); labial papilla E l.p. pointed ( Fig. 3D View FIGURE 3 ); head macrochaetotaxy with 4 ‘A’, 2 ‘M’, 2–3 ‘S’, 4 ‘Pa’, 1 ‘Pm’, 3 ‘Pp’ and 1 ‘Pe’ mac, respectively ( Fig. 3E View FIGURE 3 ); postlabial region with 3 mic and lacking H1–2 chaetae ( Fig. 3F View FIGURE 3 ); Th II a (excluding the anterior collar), m and p series with 6, 6–7 and 12 posterior mac, respectively; Th III–Abd III with 4, 0, 3 and 1 inner mac, respectively; Abd III with 8 lateral mac; Abd IV with 8 inner and 43 lateral mac/mes, and 6 mes posteriorly ( Fig. 4 View FIGURE 4 ); trochanteral organ with about 49 spine-like chaetae ( Fig. 5D View FIGURE 5 ); unguis lateral teeth developed, a.t. present; unguiculus acuminate with pe lamella serrated ( Fig. 5E View FIGURE 5 ); collophore anteriorly with 5–6 proximal spines, 3 elongated mac and 2 normal distal mac, posteriorly with 3 smooth spines on each side ( Fig. 5F View FIGURE 5 ).

Description. Total length (head + trunk) of specimens 1.45–2.47 mm (n=4), holotype 2.47 mm. Specimens ground color pale white (head, Th II to Abd I, collophore, coxae I–III and furcula) and yellowish (other body regions), with dark navy-blue pigments on distal and proximal Ant IV, proximal Ant III–II, distal ventral plate of the Abd IV and distal and proximal regions of the femur I–III, including an irregular stripe (present or absent) joining both femoral patches on the anterior side; eyepatches black ( Fig. 2 View FIGURE 2 ).

Head. Ratio antennae: trunk = 1: 1.20–1.51 (n=4), holotype 1: 1.20; antennal segments ratio as I: II: III: IV = 1: 1.33–1.82: 1.58–1.74: 1.98–2.43, holotype 1: 1.82: 1.74: 2.43. Ant III distally with 2 finger-shaped sens (of the apical organ), 3 guard sens and at least 7 sens of different sizes and shapes ( Fig. 3A View FIGURE 3 ). Ant II–I with 5 and 1 dorsal mac, respectively ( Fig. 3B View FIGURE 3 ). Labral papillae subequal in size ( Fig. 3C View FIGURE 3 ). Clypeal formula with 4 (l1–2), 6 (f), 3 (pf0–1) ciliated chaetae, l1–2 strongly acuminate, 1 frontal smaller than the others, others subequal ( Fig. 3C View FIGURE 3 ). Maxillary palp b.c. slightly thicker and 1.04 longer than the t.a. Head dorsal chaetotaxy ( Fig. 3E View FIGURE 3 ) with 8 ‘An’ (An1a–1, An2–3), 4 ‘A’ (A0, A2–3, A5), 2 ‘M’ (M1, M4), 2–3 ‘S’ (S2–3, S7), 4 ‘Pa’ (Pa1–3, Pa5), 1 ‘Pm’ (Pm3), 3 ‘Pp’ (Pp1–3) and 1 ‘Pe’ (Pe3) mac. Ventral chaetotaxy with 12–13 ciliated chaetae in the postlabial field, with 4 (G1–4), 1–2 (H3–H4) and 4 (J1–4) chaetae, J2 plus 2 median chaetae as mic, b.c. and J1 elongated, others subequal ( Fig. 3F View FIGURE 3 ).

Thorax chaetotaxy ( Fig 4A View FIGURE 4 ). Th II a, m and p series with 6 (two in a4 complex, a5–a5i2, excluding the anterior collar), 6–7 (m1–1i, m2–2i, m4i–4p) and 12 (p1i2–p1p, p2–2a, p2ea–2ep, p3, p5) mac, respectively. Th III a, m and p series with 0, 1 (m6) and 4 (p1, p2–2a, p3) mac, respectively. Ratio Th II: III = 1.65–1.59: 1 (n=4), holotype 1.65: 1.

Abdomen chaetotaxy ( Figs 4B–C View FIGURE 4 ). Abd I without mac, a, m and p series with 6 (a1–1e, a2–3, a5–6), 7 (m2i–2, m3, m4–4i, m5–6) and 2 (p5–6) mic, respectively. Abd II a, m and p series with 1 (a2), 3 (m3–3e, m5), 0 mac, respectively; a5 and m2 bothriotricha with 7 and 3 accessory chaetae, respectively. Abd III a, m and p series with 2 (a7–8?), 4 (m3, am6, pm6, m7) and 3 (p6, 6pe, p7) mac, respectively; m2 bothriotrichum with 5 accessory chaetae, bothriotricha a5 and m5 with 11 accessory chaetae between them. Abd IV with 8 inner mac on A–T series (A3, A5, si, B3–6, sm) and about 17 mac and 26 mes laterally on D–Fe series (part of homologies and variations difficult to determine); 10 sens (ps type I, others type II) and 6 posterior mes. Abd V a, m and p series with 2 (a5–6), 3 (m2–3, m5) and 5 (p1, p3–6) mac, respectively. Ratio Abd III: IV = 1: 4.43–6.84 (n=4), holotype 1: 5.06.

Body psp pattern ( Fig. 4 View FIGURE 4 ): Th II–Abd IV dorsally with 1 psp, other regions not visible.

Legs. Subcoxa I with one row of 6 chaetae and 2 psp; subcoxa II with an ‘a’ row of 14 chaetae, ‘p’ row of 4 chaetae and 2 psp; subcoxa III with one row of 10 chaetae and 2 posterior psp ( Figs 5A–C View FIGURE 5 ). Trochanteral organ with about 49 spine-like chaetae ( Fig. 5D View FIGURE 5 ). Tibiotarsus I–III inner side with at least 7 mac. Unguis b.t. on proximal one third, m.t. on distal one third and subequal to b.t., a.t. on distal one ninth and minute. Unguiculus with all lamellae acuminate and smooth (ai, ae, pi, pe), except pe serrate on its distal two thirds, with 1 minute proximal stronger tooth ( Fig. 5E View FIGURE 5 ). Ratio of empodial complex III; unguis: unguiculus = 1: 0.71; tenent hair 1.36 larger than the unguis outer edge; tibiotarsal smooth chaeta 1.14 larger than the unguiculus.

Collophore ( Fig. 5F View FIGURE 5 ). Anterior side with 11–12 chaetae, 5–6 proximal smooth spine-like chaetae, 1 thin and smaller proximal chaetae, 2 median and 1 distal ciliated mac apically acuminate, plus 2 distal mac; posterior side with 3 subapical spines and 1 apical smooth chaeta; lateral flap with about 16 chaetae, 5 smooth (2 larger than the others) and 11 ciliate.

Furcula. Manubrium ventral chaetotaxy with 1, 2, 2, 2/4 (subapical), 16–18 (apical) ciliated chaetae, subapical chaetae subequal in size, apical chaetae distribution eventually asymmetrical ( Fig. 5G View FIGURE 5 ). Manubrial plate with 3 psp and 8–10 ciliated chaetae, 2 inner larger than the others, others subequal ( Fig. 5H View FIGURE 5 ).

Type Material. Holotype male on slide ( INPA-CLL 000402 ): Brazil, Roraima, Caracaraí municipality, National Park “Serra da Mocidade” , 01°42’N, 61°44’W ( Fig. 11 View FIGURE 11 ), Amazon forest, 1050 m, 25.i‒06.ii.2016, malaise trap, M Oliveira, FF Xavier & T Mahlmann coll. GoogleMaps 9 paratypes on slides: 2 males and 4 females ( INPA-CLL 000403-408 ) plus 1 subadult male, 1 female and 1 juvenile (CC/UFRN), same data of the holotype. GoogleMaps

Etymology. The epithet is proposed (in apposition) in honor of Antonio Emilio Francisco Cipola (in memoriam, † 11 February 2019), father of the first author.

Remarks. See remarks of Seira paramilloensis sp. nov..