Coecobrya qin, Zhang, Feng & Dong, Rui-Rui, 2014

Zhang, Feng & Dong, Rui-Rui, 2014, Three new species of Coecobrya (Collembola: Entomobryidae) from southern and northwest China, Zootaxa 3760 (2), pp. 260-274 : 265-269

Coecobrya qin sp. nov.

Figs 20–31 , Tab. 1

Types. Holotype: female on slide, China: Mei county: Tangyu town: Long Mountain, alt. 683m, 34˚07’48’’N, 107˚53’44’’E, in litter of mixed hardwood-conifers forest, 8.viii.2010, F. Zhang, Z.-X. Pan and D.- Y. Yu leg. (sample number C9616). Paratypes: female on slide, same data as holotype. All deposited in NJAU.

Description. Body length up to 2.09 mm. Body white.

Antenna 1.95 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 2.00: 1.74: 3.47. Smooth spiny mic at base of antennae 3 dorsal and 3 ventral on Ant.I, 2 internal, 1 external and 2 ventral on Ant.II. Ant.II distally with 1 rod-like, unexpanded S. Chaetae 2 and 3 of Ant. III organ rod-like. Antennae without long smooth straight chaetae.

Eyes 3+3. Prelabral and labral chaetae 4/ 5, 5, 4, all smooth; five chaetae of the first row subequal. Papilla E with 4 guard chaetae; lateral process of labial palp slightly thicker than normal chaetae, with tip reaching beyond apex of labial papilla ( Fig. 20 ). Subapical chaeta of maxillary outer lobe thicker than apical one; 3 smooth sublobal hairs on maxillary outer lobe. Labial chaetae as MREL1L2, all smooth except R, R/M=0.6; chaetae H1-2, X, X2-4 ciliate. Cephalic groove posterior to labium with 7 chaetae, 2 of them smooth ( Fig. 21 ). Clypeus with 12 ciliate chaetae ( Fig. 22 ). Dorsal cephalic chaetotaxy with 4 antennal, 3 median (M) and 5 sutural (S) mac ( Fig. 23 ).

Trochanteral organ with 12–13 smooth spiny chaetae; 10 in arms and 2–3 between them ( Fig. 24 ). Partial inner differentiated tibiotarsal chaetae with ciliations closely appressed to axis, appearing smooth at low magnification. Most distal tibiotarsal whorl with 10 chaetae. Unguis with 3 inner teeth; basal paired teeth unequal at 0.5 distance from base of inner edge. Unguiculus with a large outer tooth. Tenent hair clavate ( Fig. 25 ). Abd.IV 2.43 times as Abd.III in length along dorsal midline. Ventral tube anteriorly with 2+2 large ciliate chaetae, other chaetae not clearly seen; posteriorly with 11 chaetae, distal four smooth and arranged in a row ( Fig. 26 ); each lateral flap with 7–8 chaetae, 2–3 of them weakly ciliate ( Fig. 27 ). Manubrium without smooth chaetae and anterior side with 12 distal ciliate chaetae in a row. Manubrial plaque with 2+2 pseudopores and 3+3 ciliate chaetae. Dental lobe with about 8 ciliate chaetae ( Fig. 28 ). Distal smooth part of dens slightly longer than mucro in length. Mucronal basal spine reaching tip of tooth.

Th.II with 1 medio-medial (m1), 3 medio-lateral (m4, m 4i, m4p), 15(14) posterior mac, 1 ms and 2 s-chaetae; mac p3p rarely absent. Th.III with 23 (22) mac and 2 lateral s-chaetae; mac a 4i and m 5i absent ( Fig. 29 ). Abd.I with 6 (a3, m2–4, m 2i, m4p) mac, 1 ms and 1 s-chaeta; ms internal to s-chaeta. Abd.II with 4 (m3, m3e, m3ep, m 3ei) central, 1 (m5) lateral mac and 2 s-chaetae. Abd.III with 2 (a2, m3) central, 3 (am6, pm6, p6) lateral mac and 2 s-chaetae. Abd.IV with 7 central (I, M, B4–6, A4, A6), 6 lateral mac (D3, E2–4, E2p, F1) and about 17 s-chaetae ( Fig. 30 ). Abd.V with 3 s-chaetae ( Fig. 31 ).

Ecology. In litter of mixed hardwood-conifers forest.

Etymology. Named after the first Chinese dynasty “ Qin ”, where type locality locates. Remarks. Coecobrya qin sp. nov. is the second species of the genus with 3+3 ocelli as in C. mulun Zhang, Qu & Deharveng, 2010 . It differs from the latter in body white, labial chaeta R ciliate, presence of ciliate chaeta X3 posterior to labium, a large outer tooth on unguiculus, and tergal chaetotaxy ( Table 1 ). The discovery of this new species brings confusion to the separation of tenebricosa- and boneti -groups defined by Zhang et al. (2011a). Eyed Coecobrya species belonging to boneti -group possess smooth or serrate outer edge on unguiculus, but C. qin sp. nov. has a large outer tooth as in tenebricosa -group. It is now unavailable to erect the third group of the genus unless more cases founded.

Figures

FIGURES 20 – 27. Coecobrya qin sp. nov.: 20, labial papillae E; 21, chaetae on ventral side of head; 22, clypeal chaetae; 23, dorsal cephalic chaetotaxy; 24, trochanteral organ; 25, hind claw; 26, posterior face of ventral tube; 27, lateral flap of ventral tube.

FIGURES 28 – 29. Coecobrya qin sp. nov.: 28, manubrial plaque and dental lobe; 29, thoracic chaetotaxy.

FIGURES 30 – 31. Coecobrya qin sp. nov.: Abdominal chaetotaxy. 30, Abd. I – IV; 31, Abd. V.