Hyleoglomeris nigu, Golovatch, Sergei I., Liu, Weixin & Geoffroy, Jean-Jacques, 2012

Golovatch, Sergei I., Liu, Weixin & Geoffroy, Jean-Jacques, 2012, Review of the millipede genus Hyleoglomeris Verhoeff, 1910 in China, with descriptions of new species (Diplopoda, Glomerida, Glomeridae), Zootaxa 3358, pp. 1-27 : 9-11

Hyleoglomeris nigu sp. n.

Fig. 6 .

Material examined: Holotype male ( MNHN CC 172), China, Guizhou Prov., Qianxi County, Honglin Town, Cave Luo Sai Dong, 22.11.2003, leg. L. Latella & D. Avesani. Paratypes. 1 female ( MNHN CC 172), 1 female ( IZAS), same locality, together with holotype.

Name: To emphasize the animal being isolated in its cave, “ nigu ” in Chinese meaning a “nun”; a noun in apposition.

Diagnosis: Differs from all congeners in the absence of a lobe on the caudomedial process of the telopod femur, of a setoid filament at the tip of the telopod syncoxital horns, of a telopod tibial process, coupled with a low, roundly subtriangular, central lobe of the telopod syncoxite. See also Key below.

Description: All characters like in H. tiani sp. n., except as follows.

Length ca 5.5 mm (holotype) or 7.0–8.0 mm (paratypes), width 2.8 mm (holotype) or 3.0 mm (paratypes). Coloration entirely pallid. Ocelli at least 5+1, translucid, mostly barely visible. Antennomere 6 ca 1.8 times as long as high.

Second tergite with seven transverse striae, three starting below, one level to, the remaining striae above schism, 4 (holotype) or 3 (paratypes) striae (various, but not uppermost one) from below crossing the dorsum.

Male leg 17 ( Fig. 6 A) with a high and regularly rounded outer coxal lobe; telopodite 4-segmented, tarsus devoid of subapical spines.

Male leg 18 ( Fig. 6 B) with a V-shaped syncoxital notch; telopodite 4-segmented.

Telopods ( Fig. 6 C, D) with a rather low, roundly subtriangular, central syncoxital lobe flanked by two setose horns, each latter crowned by a minute lobule. Neither prefemur nor femur micropapillate laterally. Caudomedial femoral process prominent. Caudomedial process of tibia absent; tibial tubercle on caudal face evident, papillate and pilose. Tarsus evidently sigmoid, subacuminate apically.

Remark: Due to a number of troglomorphic traits (unpigmented tegument and ocelli), this species seems to be a troglobite.

Figures

FIGURE 6. Hyleoglomeris nigu sp. n., holotype. A: leg 17, front view. B: leg 18, front view. C & D: left half of telopods, front and caudal views, respectively. Scale bar: 0.2 mm.