Sinella colubra, Xu, Guo-Liang & Chen, Wei-Yu, 2016

Xu, Guo-Liang & Chen, Wei-Yu, 2016, Two new species of Sinella from Guangdong Province, China (Collembola: Entomobryidae), ZooKeys 611, pp. 1-10 : 2-3

Taxon classification Animalia Collembola Entomobryidae

Sinella colubra sp. n. Figs 1-12, 13-16, Table 1

Type material.

Holotype: ♂ on slide, China, Guangdong Province, Huizhou City, Longmen County, Nankunshan Natural Reserve, 23°38'4.01"N, 113°51'15.25"E, altitude 497 m, 24 August 2010, Z-X Pan and Y-T Ma leg. (# S4143). Paratypes: ♂ and 3 ♀♀ on slides and 3 in alcohol, same data as holotype.

Other material.

♀ on slide, China, Guangdong Province, Nanling National Natural Reserve, 24°55'42.6"N, 113°0'58.3"E, altitude 1026 m, 22 July 2010, F Zhang and Z-H Li leg. (# C9640).

Diagnosis.

No eyes. Long smooth straight chaetae present on antennae. Clypeal chaetae eight and median three much smaller. Labial chaetae as mrel1l2. Postlabial chaetae X and X2‒4 minute. “Smooth” inner differentiated tibiotarsal chaetae present. Manubrium without smooth chaetae. Mucronal spine long, with tip nearly reaching apical tooth. Abd. I with 6+6 mac. Abd. II with 3+3 central mac. Abd. IV with 7+7 central and 4+4 lateral mac.

Description.

Body length up to 1.50 mm. Body pale in alcohol.

Antenna 1.63‒1.93 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.77‒2.00: 1.64‒1.74: 2.57‒2.91. Smooth spiny mic at base of antennae: three dorsal, three ventral on Ant. I; one internal, one external and two ventral on Ant. II. Ant. II distally with one (rarely two) rod-like sens. Ant. III organ with two slightly expanded internal sens. Ant. IV with a knobbed subapical organ. Ant. II. with 2‒4 ventral long smooth straight chaetae.

Eyes absent in all specimens. Prelabral and labral chaetae 4/ 5, 5, 4, all smooth; labral intrusion U-shaped (Fig. 1). Clypeal chaetae eight in number, including three small median chaetae (Fig. 2). Dorsal cephalic chaetotaxy with four antennal (An), three median (M) and eight sutural (S) mac; Gr. II with 3(4) mac (Fig. 3). Mandibles with 4/5 (left/right) teeth. Subapical chaeta of maxillary outer lobe slightly thicker than apical one; three smooth sublobal hairs on maxillary outer lobe. Lateral process of labial palp slightly thicker than normal chaetae, with tip extending beyond apex of labial papilla (Fig. 4). Labial chaetae as mrel1l2, all smooth, r/m=0.67‒0.79; chaetae X and X2‒4 minute; chaeta X3 rarely absent; H1-4 smooth. Cephalic groove with 9(8) chaetae, four of them smooth and others ciliate (Fig. 5).

Trochanteral organ with 17‒19 smooth spiny chaetae; 11-12 in arms and 5‒7 internal (Fig. 6). Partial inner differentiated tibiotarsal chaetae “smooth” with ciliations closely appressed to axis ( Chen and Christiansen 1993). Tibiotarsi distally with ten chaetae in a whorl. Unguis with three inner, one outer, and two lateral teeth; two paired teeth unequal, outer one large. Unguiculus with a large outer tooth. Tenent hairs of all legs pointed but clavate in one male specimen (Fig. 7). Abd. IV 3.72‒4.60 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 6‒7 ciliate chaetae on each side, two of them much larger than others (Fig. 8); posteriorly with about 13 chaetae, most of them small and weakly ciliate; each lateral flap with two ciliate and six smooth chaetae (Fig. 9). Male genital plate not clearly seen. Manubrium dorsally without smooth chaetae; ventrally with 5+5 distal ciliate chaetae (Fig. 10). Manubrial plaque with 2+2(1) pseudopores and 3+3 ciliate chaetae (Fig. 11). Distal smooth part of dens 1.08-1.57 as long as mucro. Mucro bidentate with apical tooth larger; basal spine long, with tip nearly reaching apical tooth (Fig. 12).

Th. II with three medio-medial mac (m1, m2, m2i), three medio-lateral mac (m4, m4i, m4p), 14‒18 posterior mac, one ms and two sens; ms interior to sens al. Th. III with 29‒32 mac and two lateral sens; a6i, p5, p6, m6, m6i, m6p, m6e and m6ai2 pre sent as mac; mac m5i absent (Fig. 13). Abd. I with six mac (a3, m2-4, m2i, m4p), one ms and one sens; sens interior to ms. Abd. II with three central mac (m3, m3e, m3ep), one lateral mac (m5) and two sens. Abd. III with one central mac (m3), three lateral mac (am6, pm6, p6) and two sens; ms absent (Fig. 14). Abd. IV with seven central mac (I, M, A5-6, B4-6), four (rarely five) lateral mac (D3, E2-4), and at least 17 sens (Fig. 15). Abd.V with three sens (Fig. 16).

Etymology.

Named after the snake Bungarus multicinctus Blyth found in the sampling site.

Ecology.

In soil of bamboo forest, near termitarium.

Remarks.

Sinella colubra sp. n. is most similar to Sinella insolens Chen & Christiansen, 1993 and Sinella sineocula Chen & Christiansen, 1993 in morphology of unguis and unguiculus, long mucronal spine, absence of smooth chaetae on manubrium, medial and posterior mac on Th. II, 1+1 central and 3+3 lateral mac on Abd. III, and 7+7 central mac on Abd. IV. It differs from them in 3+3(4) cephalic mac on Gr. II, absence of labial chaeta M1s, minute postlabial chaetae X and X2‒4, absence of mac m5i on Th. III, 6+6 (a2 as mes) mac on Abd. I, absence of mac m3ei on Abd. II, and 4+4(5) lateral mac on Abd. IV.