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

publication ID	https://doi.org/ 10.5852/ejt.2016.226
DOI	https://doi.org/10.5281/zenodo.3853067
persistent identifier	https://treatment.plazi.org/id/6D0587ED-D717-F23A-3662-A36DA00B5DDA
treatment provided by	Valdenar
scientific name	Coecobrya ciliata
status	sp. nov.

Treatment

Coecobrya ciliata sp. nov.

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

Figs 1C View Fig , 6 View Fig , 7 View Fig , 9D View Fig ; Table 1 View 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 View Fig ).

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 View Fig ). Ant. IV not annulated.

Eyes absent. Clypeal chaetae 15, all ciliate ( Fig. 9D View Fig ). Dorsal cephalic chaetotaxy with 5 sutural mac and 4 mac in Gr. II ( Fig. 6B View Fig ). Lateral process of labial palp thicker than normal chaetae ( Fig. 6C View Fig ). 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 View Fig ). 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 View Fig ). 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 View Fig ). 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 View Fig ); posteriorly with 2 apical smooth and 7–8 ciliate chaetae ( Fig. 6H View Fig ); 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 View Fig ).

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 View Fig ). 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 View Fig ). Abd. IV with 3 (A6, M, B5) central, 5 (F1, E2–4, E2p) lateral mac ( Fig. 7B View Fig ). Abd. V with 3 sens ( Fig. 7C View Fig ). 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 View Table 1 ).