Coecobrya xui, 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 : 261-262

Coecobrya xui sp. nov.

Figs 1–19 , Tab. 1

Types. Holotype: male on slide, China: Guangdong: He Mountain, in soil of secondary eucalypt forest, 22.x.2012, G.-L. Xu leg. Paratypes: 3 females on slide, same data as holotype. All deposited in NJAU.

Description. Body length up to 0.93 mm. Body white.

Antenna 1.44–1.80 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.59– 1.80: 1.21–1.44: 2.76–3.00. Smooth spiny mic at base of antennae 3 dorsal and 2 ventral on Ant.I, 1 internal, 1 external and 1 ventral on Ant.II. Ant.II distally with 1 expanded S. Chaetae 2 and 3 of Ant.III organ slightly expanded; chaeta 8 spiny; chaeta 9 straight and spiny ( Fig. 1 ). Subapical organite of Ant.IV slender, distally swollen. Antennae without long smooth straight chaetae.

Eyes absent. 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 thick as normal chaetae, with tip reaching beyond apex of labial papilla. Subapical chaeta of maxillary outer lobe slightly larger than apical one; 3 smooth sublobal hairs on maxillary outer lobe. Labial chaetae as MREL1L2, all smooth, R/M=0.7; chaetae X, X2 and X4 ciliate; chaeta X3 absent; a ciliate chaeta rarely present between X2 and H2. Cephalic groove posterior to labium with 7(6) chaetae, 4 of them smooth ( Fig. 2 ). Clypeus with 7 smooth chaetae ( Fig. 3 ). Dorsal cephalic chaetotaxy with 4 antennal, 3 median (M) and 3 sutural (S) mac ( Fig. 4 ).

Trochanteral organ with 7–8 smooth spiny chaetae; 5–6 in arms and 2–3 between them ( Fig. 5 ). Partial inner differentiated tibiotarsal chaetae ciliate with ciliations not closely appressed to axis. Most distal tibiotarsal whorl with 10 chaetae. Unguis with 3 inner teeth; basal paired teeth unequal at 0.45 distance from base of inner edge. Unguiculus with a large outer tooth. Tenent hair I–II pointed, III clavate ( Fig. 6 ). Abd.IV 2.75–3.06 times as Abd.III in length along dorsal midline. Ventral tube anteriorly with 5+5 ciliate chaetae ( Fig. 7 ); posteriorly with 4 smooth chaetae, proximal two much smaller ( Fig. 8 ); each lateral flap with 7 smooth chaetae ( Fig. 9 ). Manubrium anteriorly with 8 ciliate chaetae in middle line and 6 distal ciliate chaetae in a row ( Fig. 11 ); posterior side with 1+1 basal pseudopore, and 2+2 pseudopores and 2+2 ciliate chaetae in manubrial plaque. Dental lobe with 5 ciliate chaetae ( Fig. 10 ). Distal smooth part of dens slightly longer than or subequal to mucro in length. Mucronal basal spine reaching tip of tooth ( Fig. 12 ).

Th.II with 3 medio-medial (m1, m2, m 2i), 2 medio-lateral (m4, m4p), 16 posterior mac, 1 ms and 2 s-chaetae ( Fig. 14 ). Th.III with 22–23 mac and 2 lateral s-chaetae; mac m 5i and a 6i absent ( Fig. 15 ). Abd.I with 5 (m2–4, m 2i, m4p) mac, 1 ms and 1 s-chaeta ( Fig. 16 ). Abd.II with 3 (m3, m3e, m3ep) central, 1 (m5) lateral mac and 2 schaetae ( Fig. 17 ). Abd.III with 2 (a2, m3) central, 2 (am6, pm6) lateral mac and 2 s-chetae ( Fig. 18 ). Abd.IV with 5 central (I, M, B4, B5, A6), 4 lateral mac (D3, E2–4) and 9 s-chaetae; 7 s-chaetae much longer than others ( Fig. 19 ). Abd.V with 3 s-chaetae; lateral sens more anterior than normal position ( Fig. 13 ).

Ecology. In soil of secondary eucalypt forest.

Etymology. Named after G.-L. Xu who collected the animals.

Remarks. This new species from South China is closest to Tibetan Coecobrya huangi Chen and Christiansen, 1997 in absence of eyes, claw structure, manubrial smooth chaetae absent, 5+5 mac on Abd.I, 2+2 central mac on Abd.III and 5+5 central and 4+4 lateral mac on Abd.IV, but differs from the latter in 3 sutural and 3 group (Gr.) II mac on dorsal head, ciliate X, X2 and X4 on ventral head, 2 medio-lateral mac on Th.II, absence of mac a 6i on Th.III, and mic p6 on Abd.III ( Table 1 ).

Species eyes tdc lotu Ventral tube msc Manubrial plaque

anterior posterior flap pseudopores chaetae continued.

Species Cephalic chaetotaxy Chaetae on the ventral side of head continued.

Figures

FIGURES 1 – 6. Coecobrya xui sp. nov.: 1, Ant. III organ; 2, chaetae on ventral side of head; 3, clypeal chaetae; 4, dorsal cephalic chaetotaxy; 5, trochanteral organ; 6, hind claw.

FIGURES 7 – 10. Coecobrya xui sp. nov.: 7 – 9, ventral tube. 7, anterior face; 8, posterior face; 9, lateral flap; 10, posterior side of manubrium.

FIGURES 11 – 13. Coecobrya xui sp. nov.: 11, anterior side of manubrium and dental lobe; 12, mucro; 13, chaetotaxy of Abd. V.

FIGURES 14 – 19. Coecobrya xui sp. nov.: Tergal chaetotaxy. 14, Th. II; 15, Th. III; 16, Abd. I; 17, Abd. II, 18, Abd. III; 19, Abd. IV.

Tables

TABLE 1. Comparison among 12 Chinese Coecobrya species: tdc –– inner tibiotarsal differentiated chaetae; s –– smooth; c –– ciliate; lotu –– large outer tooth on unguiculus; " + " –– present; " - " –– absent; msc –– manubrial smooth chaetae; t –– tiny; Gr. III and Gr. IV –– lateral mac on Th. III defined by Chen & Christiansen (1993); Cen –– central; Lat –– lateral.

brevis	blind	s	-	7–8c	8–10s	7s +	2	2c
communis	blind	c	-	4–6c	8–13s	6–10s -	2–3	3c
huangi	blind	c	-	?	?	6–7s -	2	2–3c
liui	blind	c	-	6–9c	?	6–7s -	2	3(2)c
mulun	3+3	c	-	5c	8s	7s -	2	3c
oligoseta	blind	c	-	?	?	? +	2	2–3c
pani	blind	c	-	5c	9s	7s +	2	2c
tenebricosa	blind	s	-	4c	8s	6s +	2	2c
tibetensis	blind	c	-	5–8c	9–11s	5–7s -	2	3(4)c
draconis sp. nov.	blind	c	+	5c	6c2s	5–6s, 0̶3c -	2	4c
qin sp. nov.	3+3	s	-	?	7c4s	7–8s -	2	3c
xui sp. nov.	blind	c	-	5c	4s	7s -	2	2c