Glyphiulus liangshanensis, Chen, 2017

Chen, Hui-Ming, 2017, Two new species of the millipede genus Glyphiulus Gervais, 1847 from Southwest China (Diplopoda: Spirostreptida: Cambalopsidae), Zootaxa 4323 (2), pp. 197-208 : 203-204

Glyphiulus liangshanensis sp. nov.

Figs 7A‒F , 8A‒F , 9A‒B , 10A‒E

Type material. Holotype male, China: Sichuan Province, Liangshan Yi Autonomous Prefecture, Xichang City, Xixi , Xianren Cave (27°42'36.90"N, 102°18'25.68"E), 29 October 2015, H.M. Chen leg. ( IBGAS) . Paratypes: 6 males, 3 females and 4 juveniles, same data as holotype ; 1 male and 1 juvenile, Sichuan Province, Liangshan Yi Autonomous Prefecture, Miyi County, Baima Town , Zhuanxulong Cave (26°59'55.79"N, 102°12'23.97"E), 27 October 2015, H.M. Chen leg. ( IBGAS) .

Etymology. This specific name is derived from the type locality.

Diagnosis. The new species differ from other species in this genus except Glyphiulus intermedius Golovatch, Geoffroy, Mauriès & Van den Spiegel, 2007 ( Golovatch et al. 2007b: 446, figs 25, 26) also from Sichuan Province by the special carinotaxic formula of the collum (I+2c+III‒IV+5c+6a+pc+ma+pc+6a+5c+IV‒III+2c+I). It can be differentiated from Glyphiulus intermedius by the elongated, slender and slightly laterad curved coxosternal mesal processes of the anterior gonopods, and the short lamelliform lobe of the coxite of the posterior gonopods.

Description. Holotype with 55p + 1a + T, 37 mm long and 1.9 mm wide; paratypes (male, female) with 38‒62p + 1‒4a + T, length 16.5‒40 mm, width 1.3‒1.9 mm. Coloration light yellow-brown to red-brown ( Figs 7A‒F ). Clypeus with four teeth anteromedially ( Fig. 10C ).

All characters as in Glyphiulus latus sp. nov., except as follows. Adults with 7‒13 blackish eyes in a nearly triangular patch on each side of the head ( Fig. 7A ). Collum strongly crested, carinotaxic formula (I+2c+III‒IV+5c+6a+pc+ma+pc+6a+5c+IV‒III+2c+I) ( Figs 7A, B ). Penes relatively small, each with 2 strong setae distolaterally ( Figs 8C , 10E ). The ratio of the length of midbody legs to body diameter is lower than Glyphiulus latus sp. nov..

Anterior gonopods with a pair of shield-like coxosterna, with a pair of elongated and slightly laterad curved mesal processes, which are longer than the 1-segmented telopodites ( Figs 9A , 10A ). Posterior gonopods brush-like paramedially; distally membranous, with long, curved and medially contiguous flagella ( Figs 9B , 10B ). Distribution. Known only from type locality, Sichuan, China.

Notes. In the absence of any troglomorphic traits, this species can only be considered troglophilic at most.

Figures

FIGURE 7 A ‒ F. Glyphiulus liangshanensis sp. nov., holotype. A. anterior part of body, lateral view; B. same, dorsal view; C. midbody segments, lateral view; D. same, dorsal view; E. posterior part of body, lateral view; F. same, ventral view.

FIGURE 8 A ‒ F. Glyphiulus liangshanensis sp. nov., holotype. A. gnathochilarium, ventral view; B. legs 1, anterior view; C. legs 2, caudal view; D. legs 3, caudal view; E. cross-section of a midbody segment, caudal view; F. midbody leg, lateral view.

FIGURE 9 A ‒ B. Glyphiulus liangshanensis sp. nov., holotype. A. anterior gonopods, caudal view; B. posterior gonopods, caudal view.

FIGURE 10 A ‒ E. Glyphiulus liangshanensis sp. nov., holotype. A. anterior gonopods, caudal view; B. posterior gonopods, caudal view; C. clypeus, anterior view; D. antenna, lateral view; E. legs 2, caudal view. Abbreviations: BS, bacilliform sensilla; c, coxosterna; cmp, coxosternal mesal processes; F, flagellum; L, lamelliform lobe; P, penis; T, telopodite. Scar bars: A, B, E = 0.2 mm; C = 0.1 mm; D = 0.5 mm.