Glyphiulus calceus, Jiang, Xuankong, Guo, Xuan, Chen, Huiming & Xie, Zhicai, 2018

Jiang, Xuankong, Guo, Xuan, Chen, Huiming & Xie, Zhicai, 2018, Four new species of the Glyphiulusjavanicus group from southern China (Diplopoda, Spirostreptida, Cambalopsidae), ZooKeys 741, pp. 155-179 : 159-162

Glyphiulus calceus sp. n. Figs 1B, 7, 8, 9, 10, 11

Type material.

Holotype male, China: Guangxi Zhuang Autonomous Region, Tian’e County, Bala Town, Madong Village, Hanyaotun, Xianren Cave 24°47.117'N, 107°04.851'E, alt. 900 m, 2 Jan. 2017, X.K. Jiang, H.M. Chen & X. Guo leg. (IBGAS). Paratypes: Thirteen males, 11 females and 1 juvenile, same date and locality as holotype (IBGAS).

Etymology.

This specific name is derived from the Latin word calceus , meaning ‘shoe’ and refers to the shape of the coxosternal mesal process of the anterior gonopod.

Diagnosis.

The new species can be diagnosed by the following combination of morphological characteristics: (1) all crests on collum complete and fully developed, carinotaxic formula I–III + P + M; (2) telopodite of male legs I bi-segmented, obviously shorter than coxal process; (3) coxosternal mesal process of anterior gonopod prolonged and shoe-shaped; (4) flagellum of posterior gonopod short and zigzag-shaped. See also Key below.

Description.

Body segments with 58-67p + 1-2a + T (holotype with 67p + 1a + T). Body size of ca. 45-63 mm long and 2.6-3.1 mm wide (holotype 58 and 2.9 mm, respectively).

Colouration. Brown to yellow brown in vivo (Fig. 1B); brown to red-brown in fixed condition (Fig. 7 A–F).

Head. Each eye patch with 8-15 pigmented ocelli, arranged in two irregular vertical rows (Fig. 7B). Antennae slender, 2.90-3.28 mm long. Terminal part of antennomeres V expanded (Fig. 7B). Gnathochilarium with a separate promentum, polytrichous (Fig. 8A).

Collum. All crests complete and obvious, carinotaxic formula I–III + P + M (Fig. 7A, B).

Body segments. Postcollum constriction obvious (Fig. 7A). Metaterga strongly crested (Fig. 7 A–F). Crests with two transverse rows of tubercles, carinotaxic for mula 2/2+I/i+3/3+I/i+2/2. Anterior tubercle (except ozoporiferous one) small and upright, posterior one directed caudally, both with sharp tips (Fig. 7 A–F). Ozoporiferous tubercle round, higher than broad, obviously larger than other tubercles (Fig. 8E). Location of the tubercle behind ozopore relatively medial, set off from ozoporiferous tubercle in caudal view (Figs 7C, D, 8E). Lateral crests rather small. Midbody rings round in cross-section (Fig. 8E), 2.10-2.48 mm high (vertical diameter) and 2.19-2.59 mm wide (horizontal diameter), the ratio of height to width 0.95-0.98.

Telson. Epiproct simple, with a rounded caudal ridge and a strong dorsal tooth. Paraprocts convex. Hypoproct crescent-shaped (Fig. 7E, F).

Walking legs. 3.17-3.67 mm long, obviously longer than body width (Fig. 8E, F).

Male sexual characters. Telopodite of male legs I strongly degenerated, bi-segmented. Coxal processes obviously longer than telopodites (Fig. 8B). Penes broad, tongue-shaped (Fig. 8C). Male legs III with slender and elongated coxa (Fig. 8D). Femora VI and VII normal, not inflated.

Anterior gonopods. Coxosternum shield-like, sunken medially. Coxosternal mesal processes of anterior gonopods elongated and shoe-shaped, obviously higher than telopodites. Telopodite one-segmented, curved and moveable, with round tip and a field of microsetae at base (Figs 9A, 10A, 11A).

Posterior gonopods. Mediolateral margins of coxite brush-like. Flagella short and zigzag-shaped (Fig. 10C). A long seta at anterolateral margin (Figs 9B, 11B). Lateral margin with a field of microsetae (Fig. 10D).

Distribution.

Known only from the type locality, a cave in Tian’e County, Guangxi Zhuang Autonomous Region.