Sinhomidia guangxiensis, Jin & Jia & Yan & Jordana, 2017

Jin, Han, Jia, Shao-Bo, Yan, Hua-Chao & Jordana, Rafael, 2017, A new species of the Chinese endemic genus Sinhomidia (Collembola: Entomobryinae) described and the first description of amale of Sinhomidia bicolor, Zootaxa 4358 (3), pp. 569-576 : 572-576

Sinhomidia guangxiensis sp. nov. Jia, Jin & Jordana

Figs 9–13 , Figs 19–33 Table1

Type material. China, Holotype female, slide CGC161010508 J , CHINA, September 22, 2016 in the Qianjiadong , Guangxi Province, 1279 m asl, coordinates 25°30'N, 111°17'E. On litter; leg. Jia, Yan & Jin . September 2016.; paratypes 2 females, slide CGC161017500 J, CGX161017501J same date and locality. Deposition School of Life Sciences , Liaocheng University

Description. Maximum body length 2.4 mm (Holotype).

Colour pattern. Ground colour pale yellowish or whitish ( Fig. 9 ). Eye patches dark purple. Frontal and interantennal areas of head dark purple. Ant I–II lightly pigmented, deeply pigmented on Ant III–IV, distal parts darker. Deep purple pigments on whole of Th II, Abd I, Abd II and Abd V; Abd IV with a medial and posterior transversal stripe, and paired longitudinal bands; Abd VI and furcula without pigment. Hind leg with deep purple trochanter and femur ( Fig. 12 ).

Head. Eyes 8+8, ocelli A–F subequal, G–H smaller and sometimes difficult to see. Head with scales. Antenna 3.58–4.28 times as long as cephalic diagonal. Ratio of Ant I:II:III:IV as 1:1.50–1.59:1.29–1.50:2.76–2.94. Ant IV verticilated and with bilobed apical vesicle. Antennae without scales ( Fig. 10 ). Labral papillae absent. Labral chaetal formula as 4/554; all chaetae smooth, inner prelabral chaeta longer than outer chaeta. Chaeta a0 and a1 longer than other chaeta; chaeta b0, b1, b2 subequal; chaeta c1 longer than c2 ( Fig. 19 ). Labium ( Fig. 20 ) with E and L1 as smooth mac, M1, M2, R and L2 ciliated, M2 and R smaller than M1, similar to S. bicolor .

Thorax. Trochanteral organ with 18–20 chaetae (N= 3) ( Fig. 21 ). Coxal mac formula as 3, 3/4+2, 4+2 ( Fig. 22 ). Inner tibiotarsi chaetae clearly but weakly differentiated from normal ciliate chaetae. Tenent hair strongly spatulated; slightly longer than unguiculus and shorter than unguis. Unguis with one outer, two lateral basal teeth, and four inner teeth, all small; inner basal paired teeth similar in size, with tip reaching internal 36–40% unguis length, proximal and distal unpaired teeth ending at 80% and distal 86% from unguis base, respectively. Outer edge of unguiculus slightly serrate or undulate ( Fig. 23 ). Unguiculus 0.61–0.64 as unguis length

Abdomen. Tenaculum with 4+4 teeth and one large ciliated chaeta ( Fig. 24 ).Ventral tube anterior face with 3+3 ciliate chaetae longer than other chaetae in addition to numerous ciliate chaetae of different sizes, ( Fig. 25 ); lateral flap with 13 ciliate and 3 smooth chaetae ( Fig. 26 ), posterior face with numerous ciliate chaetae of different sizes and six smooth subapical chaetae of different sizes ( Fig. 27 );. Ratios of Manubrium:(Dens + Mucro) =1.13–1.18. Manubrium without scales on either face ( Fig. 11 ). Basal 3/4 of dens with 16 spines arranged in one row along inner edge, scales absent. Dental basal chaetae bs1–bs2 multilaterally ciliate, bs1 much thicker and longer than bs2; proximal-internal chaeta (pi) ciliate, slightly longer than bs2 ( Fig. 28 ). Mucronal apical tooth smaller than anteapical one. Mucronal basal spine shorter than apex of anteapical tooth ( Fig. 29 ).

Chaetotaxy. Dorsal chaetotaxy of head with three mac in area H1 (An2, An3a, An3), one mac in area H2 (A5), chaeta S’0 absent in area H3, three mac in area H4 (S1, S3, S4) and two mac in area H5 (Ps2, Ps5). Head macrochaetotaxy formula: 3–1–0–3–2 ( Fig. 30 ).

Dorsal thoracic chaetotaxy ( Fig. 31 ). Th. II with four medial mac (m1, m2, m 2i, m 2i 2) and five mac sublateral (m4, m 4i, m4p, a5, m5); T1–T2 areas with formula 4–5. Th III with about 22 mac. Sensilla chaetotaxy not seen on Th II (probably masked by the pigment) but present on Th III.

TABLE]. Characteristic đata for the iđentification of the species of Sinhomidia . Formulae of chaetotaxy follow Jorđana & Baquero, (200ƽ) in bolđ the đifferences (1b, means presence of Ps2 mac). The symbol "-̏ means "no information availablȅ

Sinhomidia bicolor Sinhomidia bicolor Sinhomidia bicolor Sinhomidia bicolor Sinhomidia guangxiensis sp. nov. (after Yosii, 196ƽ) (after Lee & Park, 1989) (after Zhang et al., 2009) (male)

Bođy color white yellow pale yellow pale yellow pale yellowish or whitish Bođy length 2.7̅3.0mm 3.7̅ 4.7mm 3.2mm 3.3mm 2.4mm:Heađ 2.2:1 ƽ.3:1 2.7̅3.6:1 ƽ:1 3.6̅4.3:1 Scales Bođy & manubrium bođy, Ant I & II, coxa, bođy, Ant I & II, & bođy, Ant. I & II, trochanter, only bođy

femur & manubrium manubrium femur & manubrium

Trochanteral organ chaetae 40 66̅118 40̅60 40̅60 17̅20 number

Mucro basal spine beyonđ apex of - basal spine beyonđ apex of basal spine beyonđ apex of basal spine reach apex of

subapical tooth subapical tooth subapical tooth subapical tooth Ventral tube anterior face 2+2 terminal mac 4+4 terminal mac 4+4 terminal mac 4+4 terminal mac 4+4 terminal mac H1 mac number - - 3 4 3 Hƽ mac number - - 1 1 2

T1 anđ T2 on Th II - - 3̅3 3̅3 4̅ƽ. I mac number 4 3 4 3 ƽ A1̅A2 on Abđ II - - 1̅4 1̅4 2̅4 formula of H1̅H2, - - 31031/34/14/001/0,11,1,0,8 4 1031/34/14/001/0,14,1,0,8 3103 2 / 45 / 2 4/001/0,10(16),1,0,8

̅T2, A1̅A2, A3̅Aƽ,

-10

Dorsal chaetotaxy of Abd I–III ( Fig. 32 ). Abd I with five mac (a2, a5, m2, m3, m4); Abd II with seven mac (a2, a3, m3, m3e, m3ea, m3ep, m5), areas A1–A2 with two and four mac, respectively; Abd III with 1 (m3) central and 4 lateral mac (am6, m7, p6, pm6), A3–A4–A5 areas with 0–0–1mac. Dorsal chaetotaxy of Abd IV as in Fig. 33 . Abd. IV with 10–16 anterior and nine medio-posterior mac, areas A6–A10 formula 0–10(16)–1–0–8. Abd V with about 14 mac. Abdominal segments I–IV ratio as 1:0.78–0.80:0.71–0.73:4.32–5.0. Sensilla chaetotaxy seen only on some tergites ( Figs 31–32 )

Body scales. Scales leaf-like, with tip pointed, yellowish brown and finely spinulate ( Fig. 13 ), present on head, thorax and abdomen, absent from on antennae, legs, ventral tube and furca.

Remarks. S. guangxiensis sp. nov. is close to S. bicolor the chaetotaxy of Abd III–IV. However, the species can be distinguished by distribution of scales, claw structure, number of chaetae on the trochanteral organ, and chaetotaxy of head, Th II–Abd II and macrochaeta number arranged in an arch on anterior part of Abd IV.

The genus Sinhomidia has scales on the head, thorax and abdomen, but only S. bicolor has scales on the appendages. In the diagnosis of the genus Zhang et al. (2009) record the absence of scales on dens, but it may be, as in this new species, that the scales are not present in the manubrium, so in the redefinition of the genus Sinhomidia it should be "presence or absence of scales on appendages”.

Etymology. Named after the type locality of Guangxi Province, China.

Ecology. Found in litter in Guangxi.

Figures

FIGURES 1–13. Sinhomidia bicolor male: 1, colour pattern; 2, Ant I with scales; 3, Ant II with scales; 4, Ant III without scales; 5, Ant IV without scales; 6, Manubrium with scales; 7, Hind femur with scales; 8, Tibiotarsi leg 2 without scales. Sinhomidia guangxiensis sp. nov: 9, colour pattern; 10, Ant I without scales; 11, Manubrium without scales; 12, Hind femur without scales; 13, body scales.Bar 1 and 9 = 1 mm; bar 2–8, 10–13 = 0.1 mm.

FIGURES 19–29. Sinhomidia guangxiensis sp. nov.: 19, labrum chaetotaxy; 20, labium chaetotaxy; 21, trochanteral organ; 22, coxal chaetotaxy of legs 1, 2 and 3; 23, unguis complex; 24, tenaculum; 25, ventral tube anterior face; 26, ventral tube lateral flap; 27, ventral tube distal end of posterior face; 28, basal part of dens; 29, mucro. Bar 19, 23, 24, 29 = 25 µm. Bar 20, 21, 22, 25, 26, 27, 28 = 50 µm.

FIGURES 30–33. Sinhomidia guangxiensis sp. nov.: 30, head chaetotaxy; 31, thoracic chaetotaxy; 32, Abd I–III chaetotaxy; 33, Abd IV chaetotaxy.Bar = 0.1mm.