Homidia pseudozhangi, Jing & Ma, 2023

Jing, Mei-Dong & Ma, Yi-Tong, 2023, Three new species of Entomobryidae (Collembola, Entomobryoidea) from China, ZooKeys 1167, pp. 293-315 : 293

Homidia pseudozhangi sp. nov.

Figs 2-6 , 7-14 , 15-20 , 21 , 22, 23 , 24-30

Type material.

Holotype. ♀ on slide, China, Zhejiang Province, Hangzhou City, Xihu District, Jiuxi Bus Station, 30°11'25″N, 120°06'47″E, 29 m asl, sample number 1183, collected by Y-T Ma, 6-VII-2018, from leaf litter, deposited in NTU. Paratypes. 4♀♀ on slides, same data as holotype.

Additional records.

3♀♀ on slides, China, Zhejiang Province, Hangzhou City, Linan District, Gate of Tianmu Mountain, 30°18'31″N, 119°26'44″ E, 275 m asl, sample number 1181, collected by Y-T Ma, 14-VII-2018, from leaf litter; 3♀♀ on slides, CHINA, Jiangxi Province, Yichun City, Tonggu County, Tonggu Park, 28°31'54″N, 114°22'36″E, 239 m asl, sample number 1235, collected by Y-T Ma, 14-XI-2020, from leaf litter. All deposited in NTU.

Description.

Size. Body length up to 2.31 mm.

Coloration. Ground colour pale white to pale yellow. Eye patches dark blue. Antennae gradually darker from Ant. I to Ant. IV. Brown to blue-violet pigment present on head anteriorly and laterally, thorax laterally and abdomen entirely, legs, ventral tube and basal manubrium. A narrow midline irregular longitudinal stripe present on midline from Th. II to Abd. I or II (Figs 2-6 ).

Head. Antenna 0.67-1.00 times body length; antennal segment ratio I: II: III: IV = 1: 1.23-1.50: 1.00-1.29: 1.43-2.43. Apical bulb of Ant. IV bilobed (Fig. 7 ). Ant. III organ with two distal rod-like chaetae ventrally (Fig. 8 ). Ant. II with four distal rod-like chaetae ventrally (Fig. 9 ). Eyes 8 + 8, G and H smaller than others; interocular chaetae with p, r, and t mes. Dorsal cephalic chaetotaxy with four antennal (An1, An2, An3a1, An3), five median (M1, M2, M3i, M3, M4) and eight sutural (S0, S1, S2, S3, S4, S4i, S5i, S5) mac (Fig. 10 ). Labral chaetae as 4/5, 5, 4, all smooth; labral papillae absent (Fig. 11 ). Lateral process (l.p.) of labial papilla E differentiated, as thick as normal chaeta, with tip not reaching apex of papilla E (Fig. 12 ). Chaetal formula of labial base as MRel1L2, chaetae e and l1 smooth, others ciliate, R/M as 0.40-0.67 (Fig. 13 ). Basal chaeta of maxillary outer lobe thin, subequal to apical one; sublobal plate with three smooth chaeta-like processes (Fig. 14 ).

Thorax. Th. II with four medio-medial (m1, m2, m2i, m2i2), three medio-sublateral (m4, m4i, m4p), 23-32 posterior mac, one ms and two sens (ms antero-internal to sens). Th. III with 30-43 mac and two sens (Fig. 15 ). Pseudopores on coxa I-III as 2, 3, 2, respectively; coxal macrochaetal formula as 4 (rarely 3)/4+2, 3/4+2 (Figs 16-18 ). Trochanteral organ with 37-68 smooth spiny chaetae (Fig. 19 ). Tenent hair capitate and almost subequal to inner edge of unguis in length. Unguis with four inner teeth and distal one very faint, basal pair located at 0.40-0.49 distance from base of inner edge of unguis, distal unpaired teeth at 0.67-0.73 and 0.83-0.88 distance from base, respectively; unguiculus lanceolate, outer edge slightly serrate (Fig. 20 ).

Abdomen. Range of Abd. IV length as 5.33-6.90 times as dorsal axial length of Abd. III. Abd. I usually with 11 (a1-3, a5, m2-4, m2i, m4i, m4p, a1a and a1 rarely absent), 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. 21 ). Abd. IV with two normal sens and about half length of elongate sens; anteriorly with 7-12 mac arranged in irregular transverse row, posteriorly with six central mac (A4, A5, A6, B4, B5, B6), laterally with 17-24 mac (Fig. 22 ). Abd. V with three sens, middle one posterior to m3 (Fig. 23 ). Anterior face of ventral tube with 31-42 ciliate chaetae, 3+3 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow (Fig. 24 ); posterior face with numerous ciliate chaetae and 4-5 smooth chaetae apically (Fig. 25 ); lateral flap with 7-11 smooth and 6-10 ciliate chaetae (Fig. 26 ). Manubrial plate dorsally with 8-13 ciliate chaetae and three pseudopores (Fig. 27 ); ventrally with 21-34 ciliate chaetae on each side (Fig. 28 ). Dens with 28-39 smooth inner spines (Fig. 29 ). Mucro bidentate with subapical tooth larger than apical one; tip of basal spine reaching apex of subapical tooth; distal smooth section of dens almost equal to mucro in length (Fig. 30 ).

Etymology.

Named after its similar species H. zhangi (pseudo+zhangi).

Ecology.

In the leaf litter

Remarks.

The new species is characterised by a narrow irregular longitudinal stripe on the body, smooth chaetae e and l1 on the labial base and ms antero-external to the sens on Abd. I. It is similar to H. acutus Jing & Ma, 2022, H. mediofascia Shi, Pan & Bai, 2009, H. yangdangensis Pan, 2015 and H. zhangi Pan & Shi, 2012 in colour pattern, but can be separated from them by the smooth chaetae on the labial base, the relative position of ms on Abd. I and other characters. It is also similar to H. phjongjangica Szeptycki, 1973, H. sichuanensis Jia, Zhang, Zhao & Jordana, 2010 and H. sinensis Denis, 1929 in body chaetotaxy, but there are some differences between them in colour pattern, coxal macrochaetal formula and other characters (Table 1 ).

Figures

Figure 21. Homidia pseudozhangi sp. nov. Chaetotaxy of Abd. I-III. Scale bar: 50 μm.

Figures 2 - 6. Habitus of Homidia pseudozhangi sp. nov. 2, 4 lateral view 3, 5 dorsal view 6 ventral view. Scale bars: 500 μm.

Figures 7 - 14. Homidia pseudozhangi sp. nov. 7 apex of Ant. IV 8 Ant. III organ 9 distal Ant. II 10 dorsal chaetotaxy of head 11 labrum 12 labial palp E 13 labial base 14 maxillary outer lobe. Scale bars: 20 μm.

Figures 15 - 20. Homidia pseudozhangi sp. nov. 15 chaetotaxy of Th. II-III 16 - 18 coxal chaetotaxy of fore, middle and hind leg 19 trochanteral organ 20 hind foot complex. Scale bars: 50 μm (15); 20 μm (16 - 20).

Figures 22, 23. Homidia pseudozhangi sp. nov. 22 chaetotaxy of Abd. IV 23 chaetotaxy of Abd. V. Scale bars: 50 μm (22); 20 μm (23).

Figures 24 - 30. Homidia pseudozhangi sp. nov. 24 anterior face of ventral tube 25 posterior face of ventral tube apically 26 lateral flap of ventral tube 27 manubrial plaque 28 ventro-apical part of manubrium 29 proximal section of dens (circles also representing spines) 30 mucro. Scale bars: 20 μm.