Homidia changensis sp. nov.

Figs 41-42, 43-49, 50-55, 56, 57, 58-64

Type material.

Holotype. 1♀ on slide, China, Jiangxi Province, Nanchang City, Xinjian District, Jiuxi, 28°47'56"N, 115°45'11"E, 168 m asl, sample number 1243, collected by Y-T Ma, 12-XI-2020, deposited in NTU. Paratypes. 2♀ on slides, same data as holotype.

Description.

Size. Body length up to 2.33 mm.

Colouration. Ground colour yellow. Ant. II-IV and distal part of Ant. I brown. Eye patches dark blue. Coxae, tibiotarsi, posterior part of Abd. IV and Abd. V with scattered brown pigment (Figs 41, 42).

Head. Antenna 0.50-0.57 × body length; antennal segment ratio I: II: III: IV = 1: 1.33-1.50: 1.17-1.30: 1.90-2.00. Apical bulb of Ant. IV bilobed (Fig. 43). Ant. III organ with two rod-like chaetae (Fig. 44). Ant. II with four distal rod-like chaetae (Fig. 45). Eyes 8 + 8, G and H smaller than others; interocular chaetae with p, r, and t. Dorsal cephalic chaetotaxy with three antennal (A), three ocellar (O) and five sutural (S) mac (Fig. 46). Basal chaeta of maxillary outer lobe thin, subequal to apical one; sublobal plate with three smooth chaeta-like processes (Fig. 47). Lateral process (l.p.) of labial papilla E differentiated, as thick as normal chaeta, with tip almost reaching apex of papilla E (Fig. 48). Chaetal formula of labial base as M1M2ReL1L2, chaeta e smooth, others ciliate, R/M1 as 0.63-0.70 (Fig. 49).

Thorax. Th. II with four medio-medial (m1, m2, m2i, m2i2), three medio-sublateral (m4, m4i, m4p), 32-38 posterior mac, one ms and two sens (ms antero-internal to sens). Th. III with 38-47 mac and two sens (Fig. 50). Pseudopores on coxa I-III as 2, 3, 2, respectively; coxal macrochaetal formula as 3/4+3(4), 3/4+2 (Figs 51-53). Trochanteral organ with 45-48 smooth chaetae (Fig. 54). Tenent hairs clavate and almost equal to inner edge of unguis. Unguis with four inner teeth, basal pair located at 0.31-0.41 distance from base of inner edge of unguis, distal unpaired teeth at 0.63-0.71 and 0.83-0.84 distance from base; unguiculus lanceolate, outer edge slightly serrate (Fig. 55).

Abdomen. Range of Abd. IV length as 6.03-10.40 × as dorsal axial length of Abd. III. Abd. I with 11 (a1a, a1-3, a5, m2-4, m2i, m4i, m4p) mac, ms antero-external to sens. Abd. II with six (a2, a3, m3, m3e, m3ea, m3ep) central, one (m5) lateral mac and two sens. Abd. III with two (a2, m3) central and four (am6, pm6, m7a, p6) lateral mac, one ms and two sens (Fig. 56). Abd. IV with two normal sens; anteriorly with six or seven mac arranged in irregular transverse row, posteriorly with 5-7 (A4, A6, B4-6, A5 and Ae7 sometimes present) central mac, laterally with 20-22 mac (Fig. 57). Abd. V with three sens, middle one posterior to m3 (Fig. 58). Anterior face of ventral tube with 24-27 ciliate chaetae, 3+3 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow (Fig. 59); posterior face with two or four distal smooth and numerous ciliate chaetae; lateral flap with six smooth and 14-16 ciliate chaetae (Fig. 60). Manubrial plaque dorsally with 11 or 12 ciliate chaetae and 2-4 pseudopores (Fig. 61); ventrally with 25-28 ciliate chaetae on each side (Fig. 62). Dens with 16-28 smooth inner spines (Fig. 63). Mucro bidentate with subapical tooth larger than apical one; tip of basal spine reaching apex of subapical tooth; distal smooth section of dens shorter than mucro in length (Fig. 64).

Ecology.

In the leaves litter of Phyllostachys edulis .

Etymology.

Named after its locality: Nanchang City, which is abbreviated as Chang.

Remarks.

The new species is characterised by its colour pattern and coxal macrochaetotaxy, and can be easily distinguished from all known species of Homidia . It is similar to the Chinese species H. huashanensis Jia, Chen & Christiansen, 2005, H. jordanai Pan, Shi & Zhang, 2011, and H. unichaeta Pan, Shi & Zhang, 2010 and the Korean species H. koreana Lee & Lee, 1981 in colour pattern, but significant differences exist between these species, such as chaetotaxy on Abd. I and IV and number of dental spines (Table 3).