Homidia pseudofascia, Pan, Zhi-Xiang, Zhang, Feng & Li, You-Bang, 2015

Pan, Zhi-Xiang, Zhang, Feng & Li, You-Bang, 2015, Two closely related Homidia species (Entomobryidae, Collembola) revealed by morphological and molecular evidence, Zootaxa 3918 (2), pp. 285-294 : 286-287

Homidia pseudofascia sp. nov.

Figs 1–20 Tab. 1

Type material. Holotype female on slide, Wuxi City, Yuantouzhu Park, Jiangsu Province, P. R. China, 31°31′08.92"N, 120°11′17.60"E, altitude 19± 3 m, sample number S4407, collected by Zhi-Xiang Pan, Yu-Han Pan, Chen-Chong Si and Qu-Ping Ren, 17.VII.2013. Paratypes: 4 females on slides and 3 in ethanol, same data as holotype. All types deposited in TZU except 1 paratype in NJAU.

Etymology. Named after the similarity between new species and H. fascia.

Description. Body length up to 2.74 mm.

Colour pattern. Ground colour pale white in ethanol. Eye patches dark blue and a transverse band between patches. Lateral head with a paired dark spots behind eye patches. Antennae gradually darker from Ant. I to Ant. IV. Thorax with lateral strips. A pair of separate narrow strips present on central Th. II. A median and a posterior pairs of transverse narrow but unconnected bands on Abd. IV with a pair of small spots between them. A pair of spots on lateral Abd. V. Coxa, apex of femur and tibiotarsus dirty ( Figs 1–3 ). Juveniles with similar but lighter coloration ( Fig. 4 ).

Head. Eyes 8+8, G and H smaller than others and always difficult to observe under light microscope; eye patch with 3 chaetae ( Fig. 5 ). Antennal length 1.54–2.24 times as cephalic diagonal in axial direction; antennal segments ratio as I: II: III: IV = 1: 1.55–2.41: 1.54–2.31: 2.26–3.96. Ant. II with 5 basal smooth mic ( Fig. 6 ), 3–5 (3 longer and 0–2 shorter) distal rod-like S-chaetae. Ant. III organ with 2 rod-like and 3 short guard S-chaetae ( Fig. 7 ). Apical bulb of Ant. IV bilobed ( Fig. 8 ). Dorsal cephalic chaetotaxy with 3 antennal (A), 3 ocellar ( O) and 5 sutural (S) mac ( Fig. 5 ). Prelabral and labral chaetae as 4/5, 5, 4, all smooth; labral papillae absent ( Fig. 9 ). Maxillary outer lobe with 1 apical, 1 subapical chaetae and 3 sublobal hairs on sublobal plate, subapical chaeta slightly larger than apical one ( Fig. 10 ). Chaetal formula of labial base as M1M2ReL1L2, e smooth and others ciliate; some chaetae posterior to labium slightly expanded ( Fig. 11 ). Five papillae A–E on labial palp with 0, 5, 0, 4, 4 guard chaetae, respectively. Lateral process (l.p.) thin with tip exceeding apex of papilla E ( Fig. 12 ). Mandible with 4/5 (left/right side) teeth.

Thorax. Complete body sens as 22/122(≥43)3, ms as 10/10100. Th. II with 4 (m1, m2, m 2i and m 2i 2) mediomedial, 3 (m4, m 4i and m4p) medio-sublateral and 3 S-chaetae (ms anterior to sens); posterior with about 30 mac; p4, p 4i, p 4i 2 and p5 as mac, p6 as mic. Th. III with about 35 mac and 2 sens; p5 and p6 as mac ( Fig. 13 ). Coxal macrochaetal formula as 3 (3 pseudopores)/4+1, 3 (2 pseudopores)/4+2 (pseudopores unclear). Trochanteral organ with 40–45 smooth chaetae ( Fig. 14 ). Tenent hair clavate. Unguis with 4 inner, 2 lateral and 1 outer teeth. Unguiculus lanceolate with outer edge slightly serrate.

Abdomen. Abd. IV length 7–11 times as Abd. III along dorsal medial axis. Abd. I with 11–13 (a1–3, a1a, a5, m2–4, m 2i, m 4i and m4p; a 5i sometimes present, m5 rarely present) mac (ms antero-external to sens). Abd. II with 6 (a2, a3, m3, m3e, m3ea and m3ep) central and 1 (m5) lateral mac. Abd. III with 2 (a2 and m3) central and 4 (am6, pm6, p6 and m7a) lateral mac ( Fig. 15 ). Abd. IV with at least 41 elongate and 2 normal length sens; “eyebrow” with 8–11 mac arranged in irregular transverse row; posterior central with 7–9 (A4–6, Ae7, B4–6; Ae5 and Ae6 sometimes present). Abd. V with 3 sens, middle one postero-external to m3; m3a and a 5i as mac ( Fig. 18 ). Anterior face of VT with many ciliate chaetae, 4+4 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac oblique to medial furrow ( Fig. 16 ); posterior face with 5 (2+1+2) subapical smooth chaetae; lateral flap with 5 smooth and 13 ciliate chaetae on each side ( Fig. 17 ). Manubrial plaque with 3(2) pseudopores (1 specimen with 2 pseudopores) and 11–17 ciliate chaetae ( Fig. 19 ). Denes with 36–50 spines; basal chaetae (bs1 and bs2) spiny, bs1 shorter than bs2; chaeta pi unclear. Mucro bidentate with subapical tooth larger than apical one; basal spine short, with tip reaching subapical tooth; distal smooth part of dens shorter than mucro in length ( Fig. 20 ). Tenaculum with 4+4 teeth and 1 large, multi-laterally basal ciliate chaeta.

Ecology. Found in bamboo leaf litter.

Remarks. This new species is characterized by colour pattern, labial basal chaeta M duplicated, e smooth and L1 ciliated, 7–9 central mac on posterior Abd. IV. The new species is most similar to H. fascia in dorsal chaetotaxy of the body, chaetae of ventral tube and mucro. However, it can be discriminated from the latter by the colour pattern, labial chaetae, lateral process of labial palp ( Table 1 ) and great COI divergence (>18%).

Figures

FIGURES 1 – 4. H. pseudofascia sp. nov., colour pattern: 1 – 3, adults; 1, lateral view; 2, dorsal view; 3, ventral view; 4, dorsal view of juvenile.

FIGURES 5 – 12. H. pseudofascia sp. nov.: 5, cephalic chaetotaxy; 6, basal Ant. II; 7, distal Ant. III; 8, apical bulb of Ant. IV; 9, prelabral and labral chaetae; 10, maxillary outer lobe; 11. labial chaetotaxy; 12, papilla E of labial palp.

FIGURES 13 – 17. H. pseudofascia sp. nov.: 13, chaetotaxy of Th. II – III; 14, trochanteral organ; 15, chaetotaxy of Abd. I – III; 16, anterior face of VT; 17, posterior face and lateral flap of VT.

FIGURES 18 – 20. H. pseudofascia sp. nov.: 18, chaetotaxy of Abd. IV – V; 19, manubrial plaque; 20, apical denes and mucro.