Coecobrya annulata, 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 : 8-10

publication ID	https://doi.org/ 10.5852/ejt.2016.226
DOI	https://doi.org/10.5281/zenodo.3853069
persistent identifier	https://treatment.plazi.org/id/6D0587ED-D71A-F23F-3673-A36DA72E5D48
treatment provided by	Valdenar
scientific name	Coecobrya annulata
status	sp. nov.

Treatment

Coecobrya annulata sp. nov.

urn:lsid:zoobank.org:act:D7CC34A6-E891-46AA-8FBD-570CAB9C9449

Figs 1B View Fig , 4 View Fig , 5 View Fig , 9C View Fig ; Table 1 View Table 1

Diagnosis

Ant. IV weakly annulated; 9 smooth clypeal chaetae; tiny mic r, X, X 2 and X 4 on the ventral side of head; partial inner differentiated tibiotarsal chaetae “smooth”; unguiculus lanceolate with a tiny tooth on outer edge; 9+9 mac on Abd. III with 2+2 lateral mac; Abd. IV with 6+6 central and 8+8 lateral mac.

Etymology

Named after the weakly annulated Ant. IV (Latin word “annulata”).

Material examined

Holotype CHINA: ♀ on slide, Guangxi, Longzhou, Dong Liang Dong , 14 Apr. 2010, Louis Deharveng and Anne Bedos leg. (# CHIgx10-03 ). Deposited in NJAU.

Paratypes CHINA: 2 ♀♀ on slides and 4 ♀♀ in alcohol, same data as holotype. One paratype deposited in NJAU and others in MNHN.

Description

Body length up to 3.0 mm. Body colour white or with weak orange pigments ( Fig. 1B View Fig ).

Antenna 2.1–2.8 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.8–2.1: 2.1–2.4: 2.7–3.4. Long smooth straight chaetae absent on antennae. Two internal S-chaetae of Ant. III organ paddle-like ( Fig. 4A View Fig ). Ant. IV weakly annulated in large specimens.

Eyes absent. Clypeal chaetae 9, all smooth ( Fig. 9C View Fig ). Dorsal cephalic chaetotaxy with 5 sutural (S) and 4(5) mac in Gr. II ( Fig. 4B View Fig ). Papilla E with 4 guard chaetae; lateral process of labial palp as thick as normal chaetae. Labial chaetae as mrel 1 l 2; chaetae r, X, X 2 and X 4 as smooth tiny mic; chaeta X 3 absent ( Fig. 4C View Fig ). Cephalic groove with 8 chaetae, anterior three and the fifth smooth and others ciliate.

Trochanteral organ with 15–23 smooth spine-like chaetae; 8–11 in arms and 7–12 between them ( Fig. 4D View Fig ). Partial inner differentiated tibiotarsal chaetae “smooth” with ciliations closely or moderately appressed to axis. Unguis with 3 inner teeth; 2 paired teeth unequal, outer one large. Unguiculus lanceolate with a tiny tooth, sometimes inconspicuous, on its outer edge ( Fig. 4E View Fig ). Abd. IV 4.6–6.2 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 7 ciliate chaetae on each side ( Fig. 4F View Fig ); posteriorly with 11–14 smooth chaetae ( Fig. 4G View Fig ); each lateral flap with 8–11 smooth. Manubrial plaque with 2(1) pseudopores and 4(5) ciliate chaetae. Distal smooth part of dens subequal to mucro in length ( Fig. 4H View Fig ).

Th. II with 3 medio-medial (m1, m2, m2i), 3 medio-lateral (m4, m 4i, m4p) and 24–25 posterior mac; p5 as mac ( Fig. 5A View Fig ). Th. III with 27–28 mac; p5, m 5i and a 6i as mac ( Fig. 5B View Fig ). Abd. I with 6 (m2–4, m 2i, a3, m4p) mac. Abd. II with 3 (a2, m3, m3e) central and 1 (m5) lateral mac. Abd. III with 1 (m3) central and 2 (pm6, p6) lateral mac ( Fig. 5C View Fig ). Abd. IV with 6 central (I, M, B4–5, A5–6), 8 lateral mac (F1–3, E2–4, E2p, D3) ( Fig. 5D View Fig ). Abd. V with 4 mac (m2, m3, m5, a 5i) ( Fig. 5E 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 with troglomorphic characters (long antennae, slightly modified claw, large size).

Remarks

Coecobrya annulata sp. nov. is characterized by annulated Ant. IV, two paddle-like internal S-chaetae of Ant. III organ, tiny mic r, X, X 2 and X 4 on the ventral side of head, 9 smooth clypeal chaetae, an outer tiny tooth on unguiculus (sometimes inconspicuous), 2+2 lateral mac on Abd. III, 6+6 central and 8+8 lateral mac on Abd. IV. It is also the only species having ms on Abd. III among Chinese cave Coecobrya species. It is closest to C. oculata sp. nov. from which it differs in anophthalmy, smooth clypeal chaetae, chaetae on the ventral side of head, “smooth” inner differentiated tibiotarsal chaetae, ventral tube and dorsal chaetotaxy ( Table 1 View Table 1 ).