Sinella sunae, Pan, Zhi-Xiang, Zhang, Feng & Shi, Shi-Di, 2012

Pan, Zhi-Xiang, Zhang, Feng & Shi, Shi-Di, 2012, Contribution to study of eyed species of Sinella (Collembola: Entomobryidae), with a key to this group of species from China, Zootaxa 3180, pp. 35-46 : 35-38

Sinella sunae n. sp.

Figs 1–16 , Table 1 Type materials. Holotype: female on slide, CHINA: Sichuan: Jiuzhaigou National Park: Huo Hua Hai, alt. 2200 m, 16.vii.2008, collected by X. Sun and T.L. Wang (sample number C9593), deposited in NJU. Paratypes: 2 females on slide and 3 specimens in alcohol, same data as holotype. 1 female paraptye deposited in TZU, holotype and other paratypes in NJU.

Description. Body length up to 1.3 mm, white. Antenna 1.7 times as long as cephalic diagonal. Antennal segments ratio as I:II:III:IV = 1:1.7–2.4:1.4–2.2:2.7–4.0. Smooth spiny mic at base of antennae 3 dorsal, 2 ventral on Ant. I, 1 internal, 1 external and 1 ventral on Ant. II. Long smooth straight setae absent on antennae. Distal Ant. II with 1 dorsal rod-like seta. Ant. III organ normal; seta 5 shortest; seta 8 thicker than others ( Fig. 1 ).

Eyes 1+1. Labral papillae absent. Prelabral and labral setae 4/554, all smooth; labial intrusion U-shaped ( Fig. 2 ). Lateral process of labial palp thicker than normal setae, with tip reaching and beyond apex of labial papilla ( Fig. 3 ). Subapical seta of maxillary outer lobe subequal to apical one; 3 smooth sublobal hairs on maxillary outer lobe ( Fig. 4 ). Labial setae as MREL1L2, all smooth; seta R 0.5–0.7 length of seta M; setae X and X4 as smooth mic; setae X2 and X3 absent ( Fig. 5 ). Dorsal cephalic chaetotaxy with 4 antennal (An), 5 sutural (S) mac and 3 (4) mac in Gr. II ( Fig. 6 ).

Th. II with 3 (m1, m2, m 2i) medio-medial, 3 medio-lateral (m4, m 4i, m4p), 17–20 posterior mac and 3 s-chaetae (ms internal to s); p4 and p 4i as mac. Th. III with about 20 mac and 2 lateral s-chaetae; p5 and m 5i as mic ( Fig. 7 ).

Trochanteral organ with 7–11 smooth spiny setae; 5–8 in arms and 2–3 between them ( Fig. 8 ). Partial inner differentiated tibiotarsal setae “smooth” with ciliations not closely appressed to axis; inner outstanding mac located at about 0.33 distance from base, ciliate and tapered at tip. Unguis with 3 inner teeth; basal paired teeth unequal, outer one large. Unguiculus acuminate with a large tooth on outer edge. All tenent hair clavate ( Fig. 9 ), subequal to unguiculus in length.

Abd. IV 2.2–3.2 times as Abd. III in length along dorsal midline. Abd. I with 5 (m2–4, m 2i, m4p) mac and 2 schaetae (1 ms and 1 s). Abd. II with 3 (m3, m3e, m3ep) central, 1 (m5) lateral mac and 2 s-chaetae. Abd. III with 1 (m3) central, 3 (am6, pm6, p6) lateral mac and 3 s-chaetae (1 ms and 2 s) ( Fig. 10 ). Abd. IV with 5 central (homology of anterior two mac unclear), 4 lateral mac (F1, E2–4); s-chaetae unclear ( Fig. 11 ). Abd. V with 3 s-chaetae ( Fig. 12 ). Tenaculum with 4+4 teeth and one large striate basal seta. Ventral tube anteriorly with 5+5 ciliate setae ( Fig. 13 ); posteriorly with 6–9 setae; the basal two weakly ciliate; each lateral flap with 5–7 smooth setae ( Fig. 14 ). Manubrium without smooth setae. Manubrial plaque with 2 (1) pseudopores and 2 ciliate setae ( Fig. 15 ). Distal smooth part of dens 1.8–2.3 times length of mucro. Mucro bidentate with basal spine long with tip nearly reaching apex of apical tooth ( Fig. 16 ).

Ecology. Found in forest litter.

Etymology. Named after Miss X. Sun, who collected the specimens.

Remarks. This new species is most similar to S. affluens Chen & Christiansen, 1993 in colour pattern, 1+1 eyes, claw, “smooth” inner differentiated tibiotarsal setae, mucro, setae on ventral side of the head, dorsal cephalic chaetotaxy, chaetotaxy of Th. III, Abd. II, III and lateral Abd. IV; however, it differs from latter in smooth seta 7 on Ant. III, 2 ciliate setae on manubrial plaque, absence of mac a3 on Abd. I, and 5+5 mac on central Abd. IV. Detailed differences are listed in Table 1 .

Figures

FIGURES 1 – 9. Sinella sunae n. sp.: Ant. III organ; 2, labrum; 3, lateral process of labial palp; 4, maxillary outer lobe; 5, setae on ventral side of the head; 6, dorsal cephalic chaetotaxy; 7, thoracic chaetotaxy; 8, trochanteral organ; 9, hind claw.

FIGURES 10 – 16. Sinella sunae n. sp.: 10 – 12, abdominal chaetotaxy: 10, Abd. I – III; 11, Abd. IV; 12, Abd. V; 13 – 14, ventral tube: 13, anterior face; 14, posterior face and lateral flap; 15, manubrial plaque; 16, mucro.