Coecobrya gejianbangi sp. nov.

urn:lsid:zoobank.org:act: FB0EB4BF-5950-4CFF-BC3A-A01347DB95C3

Figs 1A, 2, 3, 9B; Table 1

Diagnosis

Size large; Ant. IV annulated; 11 ciliate clypeal chaetae; labial chaetae X 1 and M 1 present; unguis elongate and devoid of unpaired tooth; unguiculus truncate with a tiny tooth on outer edge; 9+9 mac on Abd. I with a1 as mac; Abd. II with 4+4 central mac; Abd. IV with 4+4 central and 9+9 lateral mac.

Etymology

Named after Mr. Jianbang Ge, who provided help for our trip in the Mulun Natural Reserve.

Material examined

Holotype CHINA: ♀ on slide, Guangxi, Huanjiang, Mulun Natural Reserve, Dong Qiao Dong, 25.181667° N, 108.008611° E, altitude 440 m, 5 Nov. 2009, Tian MY leg. (# CHIgx09-077). Deposited in NJAU.

Paratypes CHINA: 2 ♀♀ on slides and 5 ♀♀ in alcohol, same data as holotype. One paratype deposited in NJAU and others in MNHN.

Description

Body length up to 4.2 mm. Body colour white (Fig. 1A).

Antenna 2.5–2.7 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.4–1.9: 1.1–1.9: 3.6–4.3. Long smooth straight chaetae absent on antennae. Ant. II distally with 3 dorsal rod-like S-chaetae. Two internal S-chaetae of Ant. III organ slightly expanded (Fig. 2A). Ant. IV distinctly annulated under light microscope but annulations not easily seen under stereoscope.

Eyes absent. Clypeal chaetae 11, all ciliate (Fig. 9B). Dorsal cephalic chaetotaxy with 5 sutural (S) and 4 mac in Gr. II (Fig. 2B). Lateral process of labial palp as thick as normal chaetae (Fig. 2C). Labial chaetae as m 1 m 2 rel 1 l 2; r and X 1 as spiny mic; chaetae X, X 2 and X 4 as ciliate mic; chaeta X 3 absent (Fig. 2D). Cephalic groove with 8 chaetae, anterior five smooth and others ciliate.

Trochanteral organ with 17–20 smooth spine-like chaetae; 8–9 in arms and 8–12 between them (Fig. 2E). Partial inner differentiated tibiotarsal chaetae ciliate with ciliations not closely appressed to axis. Unguis narrow with 2 subequal tiny inner teeth near base; unpaired tooth absent. Unguiculus truncate with a tiny tooth on outer edge (Fig. 2 F–G). Abd. IV 4.0–5.0 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with about 7 ciliate chaetae on each side (Fig. 2H); posteriorly with 16–18 chaetae, three of them smooth (Fig. 2I); each lateral flap with 7–8 smooth chaetae (Fig. 2J). Manubrial plaque with 2 pseudopores and 4 ciliate chaetae (Fig. 2K). Distal smooth part of dens 0.7–0.8 times as long as mucro.

Th. II with 3 medio-medial (m1, m2, m2i), 3(2) medio-lateral (m4, m4i, m4p) and 25–26 posterior mac; p4–5 and p4i as mac; mac m4i rarely absent. Th. III with about 35 mac; mac m5i and a6i present; p3p rarely present (Fig. 3A). Abd. I with 9 (a1–3, m2–4, m2i, m4i, m4p) mac. Abd. II with 4 (a2, a3, m3, m3e) central and 1 (m5) lateral mac. Abd. III with 1 (m3) central and 4 (a7, am6, pm6, p6) lateral mac; ms absent (Fig. 3B). Abd. IV with 4 central (I, M, B5, A6), 9 lateral mac (F1–3, F3a, E2–4, E2p, D3) and several additional large mesochaetae or small mac laterally (Fig. 3C). Abd. V with 3 sens (Fig. 3D). S-chaetae formula: 2+ms, 2/1+ms, 2, 2+ms, 2, 3. Uncertain number of longer S-like chaetae on Abd. IV.

Ecology

Cave-restricted species.

Remarks

Coecobrya gejianbangi sp. nov. is characterized by a very large size, distinctly annulated Ant. IV, elongate unguis devoid of unpaired tooth, 11 ciliate clypeal chaetae, labial chaetae X 1 and M 1 present, mac a1 on Abd. I, mac a2 and a3 on Abd. II, mac a7 on lateral Abd. III, and 9+9 lateral mac on Abd. IV. It is closest to another cave species, C. ciliata sp. nov., but differs from it in labial chaetae, and abdominal chaetotaxy (Table 1).