e, 3+3 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac parallel to median furrow (Fig. 16); posterior face with 3 or 4 (1+1+1 or 2+2) subapical smooth chaetae; lateral flap with 6 smooth and 16–18 ciliate chaetae on each side (Fig. 17). Manubrial plaque with 3 pseudopores and 8–11 ciliate chaetae (Fig. 19). Dentes with 32–49 spines; basal chaetae (bs1 and bs2) spiny, bs1 shorter than bs2; pi ciliated and slightly longer than bs2 (Fig. 20). Mucro bidentate with subapical tooth larger than apical one; basal spine short, with tip not reaching apical tooth; distal smooth part of dentes subequal to mucro in length (Fig. 21). Tenaculum with 4+4 teeth and 1 large, multi-laterally basal ciliate chaeta.
Homidia taibaiensis sp. n. 15 dorsal chaetotaxy of Abd. I–III 16 anterior face of ventral tube 17 posterior face and lateral flap of ventral tube.
Homidia taibaiensis sp. n. 18 dorsal chaetotaxy of Abd. IV–V 19 manubrial plaque 20 basal dentes 21 apical dentes and mucro.
Found in the leaf litter of Brassica campestris L. on farmland, altitude 1165±8 m.
This new species is characterized by unique colour pattern, such as ground colour yellow (especially VT and furcula), dark brown head (including ventral side), Abd. II with posterior white band, labial basal chaetae E and L1 ciliate, m5 as mac on Abd. I and 8 mac present on median posterior Abd. IV.
The new species is closest to Homidia socia Denis, 1929 in chaetotaxy, relative to the ciliate labial base chaetae E and L1, m5 on lateral Abd. I as mac, A4–6 and B4–6 as mac on posterior Abd. IV. However, it can be easily discriminated from the latter by colour pattern (without longitudinal stripe in the former, three stripes in the latter) and other characters, such as 3 mac in S sets on dorsal head (4 in the latter), m3 as mac on middle Abd. III (as mic in the latter) and without mac anterior to “eyebrow” on Abd. IV (with 2 mac in the latter). Also, this species is similar to Homidia similis Szeptycki, 1973 in chaetotaxy, detailed differences between them are listed in Table 1.
Differences between Homidia taibaiensis sp. n. and other two closest species of Homidia.
Sinella triseta sp. n.
1♀ on slide, Baoji City, Mei County, Haoping Temple manage department, Shaanxi Province, CHINA, 34°05.18'N, 107°42.08'E, sample number S4325, collected by Xiang-Qun Yuan, Zhi-Xiang Pan, 11.VII.2012.
5♀, 1♂ on slide and 3 in alcohol, same data as holotype, all types deposited in School of Life Sciences, Taizhou University.
Named using the Latin words “tri+seta” (three mac on each side of posterior Abd. IV).
Body length up to 1.17 mm, white (Fig. 22).
Habitus of Sinella triseta sp. n.
Head. Antenna 1.27–1.61 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.67–2.05: 1.42–1.71: 1.95–3.28. Smooth spiny mic at base of antennae as 3 dorsal, 4 ventral on Ant. I (Fig. 24) and 4 on Ant. II (Fig. 25). Ant. III organ with 5 rod-like S-chaetae (Fig. 26). Ommatidia absent. Dorsal cephalic chaetotaxy with 4 antennal (An), 5 sutural (S) and 4 mac in Gr. II (Fig. 23). Clypeus with 7 chaetae arranged in two lines (4 ciliate and 3 smooth) (Fig. 27). Labral papillae absent; prelabral and labral chaetae as 4/5, 5, 4, all smooth; labial intrusion U-shaped (Fig. 28). Subapical chaeta of maxillary outer lobe shorter than apical one; 3 smooth sublobal hairs on maxillary outer lobe. Labial chaetae as MREL1L2, all smooth; chaeta R subequal to M; chaetae X and X4 as peg-like, smooth mic; chaetae X2 and X3 absent (Fig. 29). Five papillae A–E on labial palp with 0, 5, 0, 4, 4 guard chaetae, respectively. Lateral process (l.p.) of labial palp as thick as normal chaetae, with tip beyond apex of labial papilla E (Fig. 30). Mandible with 4/5 (left/right side) teeth.
Sinella triseta sp. n. 23 dorsal cephalic chaetotaxy 24 basal chaetae of Ant. I 25 basal chaetae of Ant. II 26 Ant. III organ 27 clypeus 28 labrum 29 labial base 30 labial palp.
Thorax. Complete body s as 22/122 (14–16) 3; ms as 10/10000. Th. II with 4 (m1, m2, m2i and m2i2) medio-medial, 3 medio-lateral (m4, m4i, m4p), 18–21 posterior mac and 3 S-chaetae (ms internal to s); p4 as mac, p5 and p6 as mic, p1i2 and p4i sometimes absent. Th. III with about 30 mac and 2 lateral S-chaetae; p5, p6 and a5e as mic, p4 rarely as mac (Fig. 31). Coxal macrochaetal formula as 3 (2 p)/4+1, 3 (2 p)/4+2 (2 p) (Fig. 32). Trochanteral organ with 8–12 smooth spiny chaetae; 5–11 in arms and 2–3 between them (Fig. 33). 3–4 inner differentiated tibiotarsal chaetae “smooth” with ciliations closely appressed to axis. Tenent hair all acuminate and subequal to inner edge of unguis. Unguis with 3 inner teeth, basal paired teeth unequal, outer one larger. Unguiculus acuminate with a large tooth on outer edge (Fig. 34).
Sinella triseta sp. n. 31 dorsal chaetotaxy of Th. II–III 32 coxal mac formula (A fore leg; B mid leg; C hind leg) 33 trochanteral organ 34 tip tibiotarsus and claw of hind leg.
Abdomen. Abd. IV 2.94–4.34 times as Abd. III in dorsal axial length. Abd. I with 6 (a3, m2–4, m2i, m4p) mac and 2 S-chaetae (ms antero-external to 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 2 S-chaetae (lateral ms absent) (Fig. 35). Abd. IV with 3 central (A6, B5 and anterior one homology uncleared mac), 4 lateral mac (F1, E2–4), 12–14 elongate and 2 normal S-chaetae. Abd. V with 3 obvious mac (m2, m3 and m5) and 3 S-chaetae (Fig. 36). Tenaculum with 4+4 teeth and one large basal chaeta. Anterior face of ventral tube with 5+5 ciliate chaetae (Fig. 37); posterior with 2+2 basal weekly ciliate and 2+2 subapical smooth chaetae, an additional smooth chaeta sometimes present between basal and apical region; lateral flap with 7–8 smooth chaetae, among them 0–2 weekly ciliated among them (usually unclear under light microscope) (Fig. 38). Manubrium without smooth chaetae. Manubrial plaque with 2 pseudopores and 3 ciliate chaetae (Fig. 39). Distal smooth part of dentes approximately 2 times as mucro in length. Mucro bidentate with basal spine long with tip reaching apex of apical tooth (Fig. 40).
dorsal chaetotaxy of Abd. I–III of Sinella triseta sp. n.
Sinella triseta sp. n. 36 dorsal chaetotaxy of Abd. IV–V 37 anterior face of VT 38 posterior face and lateral flap of VT 39 manubrial plaque 40 apical dentes and mucro.
Found under stones in forest, altitude 1185±10 m.
This new species is characterized by 3 mac on posterior middle Abd. IV, ommat