Hyleoglomeris rhinoceros, Liu, Weixin & Tian, Mingyi, 2015

Liu, Weixin & Tian, Mingyi, 2015, A checklist of millipede genus Hyleoglomeris Verhoeff, 1910 in mainland China, with descriptions of seven new species (Diplopoda, Glomerida, Glomeridae), Zootaxa 4032 (1), pp. 103-116 : 107

Hyleoglomeris rhinoceros sp. n.

Fig. 3 .

Material examined. Holotype male ( SCAU), China, Guizhou, Qixinan Zizhizhou, Anlong County, Dushan Town, Cave Xiniu Dong, 25°18’54.10’’N, 105°35’29.55’’E, 1024 m, 27.XII.2012, leg. Tian Mingyi, Liu Weixin, Sun Feifei, Yin Haomin. Paratypes. 2 males, 1 female ( SCAU), same locality, together with holotype.

Etymology. To emphasize the provenance of this species cave “Xiniu”, in Chinese meaning “ rhinoceros ”; noun in apposition.

Diagnosis. Keys out as H. albicorporis Zhang & Zhang, 1995 (see Golovatch et al. 2012), but differs in male leg telopodite 17 being 3-segmented, the central lobe of telopod syncoxite rather high and linguiform, combined with a curved tip of the caudomedial femoral process which supports a large membranous sac, and a small lobe in the middle on the caudal face.

Description. Length of both sexes ca 4.5–7.0 mm, width 3.5–5.0 mm. Coloration entirely pallid. Ocelli at least 4+1, translucent, barely visible. Tömösváry’s organ transverse-oval, only slightly wider than long. Antennomere 6 ca 2.0–2.2 times as long as wide.

Collum with two transverse striae. Thoracic shield with a broad hyposchism, the latter reaching up to caudal tergal margin; 6 transverse striae, 2(3) starting below, one level to, 2(3) above schism, 2 striae (never the 4th to 6th from below) crossing the dorsum. Pygidium of both sexes slightly concave medially at caudal margin.

Male leg 17 ( Fig. 3 A) with a high and irregularly shaped outer coxal lobe; telopodite 3-segmented, tarsus with two subapical spines.

Male leg 18 ( Fig. 3 B) with an arch-shaped syncoxital notch, occasionally coxae with two apical spines; telopodite 4-segmented.

Telopods ( Fig. 3 C) with a rather high, linguiform, sparsely setose, central syncoxital lobe flanked by two setose horns, each latter crowned with a small lobule supplied with an adjacent mesal setoid filament ( Fig. 3 D). Prefemur and femur faintly micropapillate laterally. Prefemur with a well-developed frontomedial trichostele. Femur with a smaller frontomedial trichostele. Caudomedial femoral process prominent, densely setose, tip curved, supporting a large membranous sac, and a small lobe in the middle on the caudal face. Tibia with a strong distomedial seta, caudomedial process present; a distinct, papillate tubercle at base on caudal face. Tarsus rather strongly sigmoid, narrowly subacuminate apically.

Remark. In this new species, not only male pygidium, but also the female one is slightly concave medially at the caudal margin. Based on the entirely unpigmented tegument and ocelli, this species is likely to be a troglobite.

Figures

FIGURE 3. Hyleoglomeris rhinoceros sp. n., male paratype. A. leg 17, front view. B. leg 18, front view. C. right half of telopods, front view. D. tip of syncoxital horn, front view. Scale bar: 0.5 mm.