Coecobrya ciliata, Zhang & Bedos & Deharveng, 2016

Zhang, Feng, Bedos, Anne & Deharveng, Louis, 2016, Cave-dwelling Coecobrya from southern China with a survey of clypeal chaetae in Entomobryoidea (Collembola), European Journal of Taxonomy 226, pp. 1-21 : 11-13

Coecobrya ciliata sp. nov.

urn:lsid:zoobank.org:act:1E2353EF-E3B5-4ED9-8A6A-9A4371452F37

Figs 1C, 6, 7, 9D; Table 1

Diagnosis

Small size; long smooth straight chaetae present on antennae; 15 ciliate clypeal chaetae; labial chaeta R ciliate; postlabial chaetae H 1–4 ciliate; unguis elongate; unguiculus truncate or swollen with a tiny tooth on outer edge; Abd. IV with 3+3 central and 5+5 lateral mac.

Etymology

Named after the ciliate chaetae H 1–4 on the ventral side of head.

Material examined

Holotype

CHINA: ♀ on slide, Guangxi, Huanjiang, Mulun, Mashan Dong , 19 May 2007, Louis Deharveng, Anne Bedos and Youbang Li leg. (# CHIgx07-19-01). Deposited in NJAU.

Paratype

CHINA: ♀ on slide and same data as holotype. Deposited in MNHN.

Additional material

CHINA: 1 ♀ on slide and 4 ♀♀ in alcohol, Guangxi, Huanjiang, Mulun, Dong Zai Dong, 20 May 2007, L. Deharveng et al. leg. (# CHIgx07-20-01). Deposited in MNHN.

Description

Body length up to 1.35 mm. Ground colour pale yellow in alcohol ( Fig. 1C).

Antenna 1.4–1.8 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.5–2.2: 1.1–1.9: 2.5–3.0. Ant. I ventrally with long smooth straight chaetae. Two internal S-chaetae of Ant. III organ slightly expanded ( Fig. 6A). Ant. IV not annulated.

Eyes absent. Clypeal chaetae 15, all ciliate ( Fig. 9D). Dorsal cephalic chaetotaxy with 5 sutural mac and 4 mac in Gr. II ( Fig. 6B). Lateral process of labial palp thicker than normal chaetae ( Fig. 6C). Labial base as mRel 1 l 2, all smooth except R; R/m = 0.5; chaetae H 1–4, X and X 2–4 ciliate ( Fig. 6D). Cephalic groove with 7 chaetae, the anterior one (G 1) smooth and others ciliate.

Trochanteral organ with 9–16 smooth spine-like chaetae; 7–8 in arms and 3–6 between them ( Fig. 6E). Inner differentiated tibiotarsal chaetae ciliate with ciliations not closely appressed to axis, most distal one smooth on hind claw. Ungual basal paired teeth unequal with outer one larger, 20% distance from the base; distal unpaired tooth tiny, 25% distance from the base. Unguiculus truncate or swollen with a tiny tooth, sometimes inconspicuous, on outer edge ( Fig. 6F). Abd. IV 3.1–3.5 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 5–6 ciliate chaetae on each side, one of them much larger than others ( Fig. 6G); posteriorly with 2 apical smooth and 7–8 ciliate chaetae ( Fig. 6H); lateral flap with 5 smooth and 1–2 ciliate chaetae. Manubrial plaque with 2 pseudopores and 4–5 ciliate chaetae. Distal smooth part of dens 0.7 times as long as mucro ( Fig. 6I).

Th. II with 3(4) (m1, m2, m2i) medio-median, 3 (m4, m4p, m4i) medio-lateral and about 20 posterior mac; p4, p4i and p5 as mac; mac m1i and p4i rarely present. Th. III with about 31 mac; m5i, a6i and p5 as mac ( Fig. 6J). Abd. I with 6 (m2i, m2, m3, a3, m4 and m4p) mac. Abd. II with 3 (a2, m3, m3e) central and 1 (m5) lateral mac. Abd. III with 1 (m3) central and 3 (am6, pm6, p6) lateral mac ( Fig. 7A). Abd. IV with 3 (A6, M, B5) central, 5 (F1, E2–4, E2p) lateral mac ( Fig. 7B). Abd. V with 3 sens ( Fig. 7C). 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, moderately troglomorphic (slightly modified claw).

Remarks

Ciliate chaetae H 1–4 on the ventral side of head in C. ciliata sp. nov. are observed in Coecobrya for the second time since C. draconis . Small size, 15 ciliate clypeal chaetae, long smooth straight chaetae on antennae, elongate unguis, truncate or swollen unguiculus, tiny outer tooth on unguiculus (sometimes inconspicuous), and 5+5 lateral mac on Abd. IV are also characteristic. It is closest to C. draconis but differs from it in long smooth straight chaetae on antennae and chaetotaxy of Abd. IV ( Table 1).