Homidia oligoseta Zhou, Huang & Ma, 2024, sp. nov.
Creators: name: Zhou, Rong
name: Huang, Ling
name: Ma, Yi-Tong
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Entomobryidae
Homidia
Homidia oligoseta

description: Homidia oligoseta sp. nov.
Figs 87–89, 90-96, 97, 98, 99-106, 107, 108, 109–116, Tables 3, 4
Type material.
Holotype • ♀ on slide, China, Guangxi Zhuang Autonomous Region, Guilin City, Longsheng Autonomous County, Huaping Natural Reserve, Tianping Mountain, 31 - V- 2023, 25 ° 37 ′ 52 ″ N, 109 ° 54 ′ 47 ″ E, 935.4 m asl, sample number 1281. Paratypes • 2 ♀ on slides, same data as holotype • 4 ♀ on slides, China, Guangxi Zhuang Autonomous Region, Guilin City, Longsheng Autonomous County, Huaping Natural Reserve, Tianping Mountain, 1 - VI- 2023, 25 ° 38 ′ 01 ″ N, 109 ° 54 ′ 30 ″ E, 707.8 m asl, sample number 1282 • 7 ♀ on slides, China, Guangxi Zhuang Autonomous Region, Guilin City, Longsheng Autonomous County, Huaping Natural Reserve, Tianping Mountain, Power Station, 2 - VI- 2023, 25 ° 37 ′ 40 ″ N, 109 ° 54 ′ 19 ″ E, 682.0 m asl, sample number 1283. All collected by Y-T Ma.
Description.
Size. Body length up to 2.21 mm.
Coloration. Ground colour pale white to yellow; eye patches dark blue; brown to blue-violet pigment present on whole dorsal body, antennae, legs, ventral tube, and manubrium; some unpigmented irregular stripes or spots present on dorsal side of body; Th. II often with less brown pigment (Figs 87–89).
Head. Antenna not annulated and 0.56–0.62 times length of body. Ratio of Ant. I – IV as 1.00 / 1.25–1.47 / 1.00 – 1.43 / 2.00 – 2.71. Distal part of Ant. IV with many sensory chaetae and normal ciliate chaetae, apical bulb bilobed (Fig. 90). Sensory organ of Ant. III with two rod-like chaetae (Fig. 91). Sensory organ of Ant. II with 2–3 rod-like chaetae (Fig. 92). Eyes 8 + 8, G and H smaller than others, interocular chaetae as p, r, t mes. Dorsal chaetotaxy of head with four antennal (An), five median (M) and eight sutural (S) mac (Fig. 93). Prelabral and labral chaetae as 4 / 5, 5, 4, all smooth, a 0, a 1 longer than a 2; labral papillae absent (Fig. 94). Basal chaeta on maxillary outer lobe slightly thicker than as apical one; sublobal plate with three smooth chaetae-like processes (Fig. 95). Lateral process (l. p.) of labial palp E differentiated, as thick as normal chaeta, with tip reaching or exceeding apex of papilla E (Fig. 96). Labial base with MRel 1 L 2, chaetae e and l 1 smooth, other ciliate; R 0.53–0.60 length of M. All post-labial chaetae ciliate (Figs 97, 98).
Thorax. Tergal ms formula on Th. II – Abd. V as 1, 0 / 1, 0, 1, 0, 0, sens as 2, 2 / 1, 2, 2, 39–55, 3 (Figs 99, 107 – 109). Th. II with four medio-medial (m 1, m 2, m 2 i, m 2 i 2), three medio-sublateral (m 4, m 4 i, m 4 p), 32–37 posterior mac. Th. III with 45–50 mac (Fig. 99). Coxal macrochaetal formula as 3 (4) / 4 + 1, 3 (4) / 4 + 2 (Figs 100–102). Trochanteral organ with 40–57 smooth chaetae (Fig. 103). All tenent hairs pointed and 0.60–0.86 length of inner edge of unguis; unguis with three inner teeth, basal pair located at 0.30–0.36 distance from base of inner edge of unguis, unpaired tooth at 0.58–0.71 distance from base; unguiculus lanceolate, outer edge slightly serrate (Figs 104–106).
Abdomen. Range of Abd. IV length as 4.75–6.25 times as dorsal axial length of Abd. III. Abd. I with 11 (10) (a 1–3, m 2 i, m 2–4, m 4 i, m 4 p and a 5, a 1 a sometimes absent) mac. Abd. II with six (a 2, a 3, m 3, m 3 e, m 3 ea, m 3 ep) central, one (m 5) lateral mac. Abd. III with two (a 2, m 3) central, four (am 6, pm 6, m 7 a, p 6) lateral mac (Fig. 107). Abd. IV with two (as, ps) normal sens, 3–4 (5) anterior, 4 (5) (A 4–6, B 4–5, A 5 rarely present) posterior and 11–17 lateral mac (Fig. 108). Abd. V with three sens (Fig. 109). Anterior face of ventral tube with 19–24 ciliate chaetae on each side, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow (Fig. 110); posterior face with 5–7 smooth and numerous ciliate chaetae (Fig. 111); lateral flap with 6–10 smooth and 7–12 ciliate chaetae (Fig. 112). Manubrial plate dorsally with 9–12 ciliate mac and three pseudopores (Fig. 113); ventrally with 22–30 ciliate chaetae on each side (Fig. 114). Dens with 16–31 smooth inner spines (Fig. 115). 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. 116).
Etymology.
The name of the new species is derived from the Latin oligo and seta, which means only a few chaetae are present on each side of the anterior part of Abd. IV.
Ecology.
Found in the leaf litter.
Remarks.
The new species is very similar to H. huapingensis sp. nov. and H. acutus Jing & Ma, 2022 in the colour pattern and pointed tenent hair, but can be separated from them by the chaetotaxy of Abd. IV and smooth post-labial chaetae. The detailed character comparisons are listed in Tables 3, 4.
description: Published as part of Zhou, Rong, Huang, Ling & Ma, Yi-Tong, 2024, Smooth post-labial chaetae in Homidia (Collembola, Entomobryidae) and the description of four new species from China with the aid of DNA barcoding, pp. 41-73 in ZooKeys 1213 on pages 41-73, DOI: 10.3897/zookeys.1213.123839