Homidia guangxiensis 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 guangxiensis

description: Homidia guangxiensis sp. nov.
Figs 28–29, 30-36, 37-39, 40-45, 46, 47, 48-51, 52–56, Table 3
Type material.
Holotype • ♀ on slide, 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. Paratypes • 3 ♀♀ on slides, same data as 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. All collected by Y-T Ma.
Description.
Size. Body length up to 2.86 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 (Figs 28, 29).
Head. Antenna not annulated and 0.60–0.80 times length of body. Ratio of Ant. I – IV as 1.00 / 1.27–1.70 / 1.21 – 1.40 / 1.67 – 2.41. Distal part of Ant. IV with many sensory chaetae and normal ciliate chaetae, apical bulb bilobed (Fig. 30). Sensory organ of Ant. III with two rod-like chaetae (Fig. 31). Sensory organ of Ant. II with 3–4 rod-like chaetae (Fig. 32). 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. 33). Prelabral and labral chaetae as 4 / 5, 5, 4, all smooth, a 0, a 1 longer than a 2; labral papillae absent (Fig. 34). Basal chaeta on maxillary outer lobe slightly thicker than as apical one; sublobal plate with three smooth chaetae-like processes (Fig. 35). Lateral process (l. p.) of labial palp E differentiated, as thick as normal chaeta, with tip almost reaching apex of papilla E (Fig. 36). Labial base with MRel 1 L 2, M sometimes smooth, R ciliate and 0.50–0.53 length of M, chaetae e and l 1 smooth, L 2 rarely smooth; some post-labial chaetae (G 1–4, H 2–4, sometimes X and an unnamed chaeta) smooth (Figs 37–39).
Thorax. Tergal ms formula on Th. II – Abd. V as 1, 0 / 1, 0, 1, 0, 0, sens as 2, 2 / 1, 2, 2, 18–36, 3 (Figs 40, 46 – 48). 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), 33–39 posterior mac. Th. III with 44–49 mac (Fig. 40). Coxal macrochaetal formula as 3 / 4 + 1, 3 / 4 + 2 (Figs 41–43). Trochanteral organ with 44–71 smooth chaetae (Fig. 44). Tenent hair clavate, 0.68–0.88 length of inner edge of unguis; unguis with three inner teeth, basal pair located at 0.32–0.40 distance from base of inner edge of unguis, unpaired tooth at 0.59–0.68 distance from base; unguiculus lanceolate, outer edge slightly serrate (Fig. 45).
Abdomen. Range of Abd. IV length as 6.51–8.75 times as dorsal axial length of Abd. III. Abd. I with 11 (rarely 10) (a 1–3, m 2 i, m 2–4, m 4 i, m 4 p and a 5, a 1 a rarely 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. 46). Abd. IV with two (as, ps) normal sens, 8–11 anterior, five (A 5–6, B 4–6, Ae 7) posterior and 20–23 lateral mac (Fig. 47). Abd. V with three sens (Fig. 48). Anterior face of ventral tube with 44–46 ciliate chaetae on each side, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow (Fig. 49); posterior face with 9–18 smooth and numerous ciliate chaetae (Figs 50, 51); lateral flap with 7–12 (19) smooth and 11–19 ciliate chaetae (Fig. 52). Manubrial plate dorsally with 10–14 ciliate mac and three pseudopores (Fig. 53); ventrally with (26) 40–47 ciliate chaetae on each side (Fig. 54). Dens with 24–48 smooth inner spines (Fig. 55). 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. 56).
Etymology.
Named after its locality: Guangxi Zhuang Autonomous Region.
Ecology.
Found in the leaf litter.
Remarks.
The new species can be easily distinguished from other species of the genus by the smooth post-labial chaetae and the number and location of smooth chaetae on the posterior face of the ventral tube. Among the known Homidia species, except those species with expanded post-labial chaetae, the post-labial chaetae are rarely mentioned because most have normal ciliate chaetae. Smooth post-labial chaetae are discovered for the first time in the genus. In addition, the smooth chaetae on the posterior face of the ventral tube are usually located at the most distal part of the ventral tube and their number is usually less than 10 in the genus. However, the number and location of the smooth chaetae on the posterior face of the new species are peculiar. It is similar to the species H. acutus Jing & Ma, 2022, H. pseudozhangi Jing & Ma, 2023 and H. zhangi Pan & Shi, 2012 in the colour pattern, but can be separated from them by the smooth post-labial chaetae, inner teeth on unguis and other characters. The detailed character comparisons are listed in Tables 3, 4.
*? not clearly seen.
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