Polylobosoma corollifera, Chen & Zheng & Jiang, 2023

Chen, Hui-Ming, Zheng, Chang-Bin & Jiang, Xuan-Kong, 2023, The millipedes (Diplopoda) in Yintiaoling National Natural Reserve, Southwest China, Zootaxa 5257 (1), pp. 49-81 : 67-68

Polylobosoma corollifera sp. nov.

Figs 23–25

Type materials. Holotype male: China, Chongqing, Wuxi County, Yintiaoling National Nature Reserve, Huangcaoping , 31°25’7.20” N, 109°55’59.33” E, alt. 2098 m, 20 August 2022, X.K. Jiang & H.M. Chen leg. Paratypes: 2 females, same data as holotype ; 1 male, Yintiaoling National Nature Reserve , Linkouzi, 31°28’19.47” N, 109°52’58.34” E, alt. 1680 m, 17 August 2022, X.K. Jiang & H.M. Chen leg ; 2 females, Yintiaoling National Nature Reserve , Shizhuzi, 31°32’4.68” N, 109°42’16.26” E, alt. 2210 m, 11 August 2022, X.K. Jiang & H.M. Chen leg.

Diagnosis. This species is very similar to Polylobosoma panda (Golovtach, 2009) from Foping Nature Reserve, Shaanxi Province, China. It can be distinguished from the latter by the tips of the solenomere and the solenophore pointed laterally ( Figs 24 , 25 ), not caudally as in P. panda .

Etymology. This specific name is an adjective Latin word, meaning ‘coronal’ and refers to the shape of the solenophore of the gonopod.

Description. Length ca. 43–46 mm (male), 44–45 mm (female), width of midbody pro- and metazona 4.0– 4.1 mm and 5.8–6.1 mm (male), 5.0– 5.2 mm and 6.1–6.3 mm (female), respectively. Head and dorsum of the body black, paraterga whitish or light yellow, venter and legs reddish brown ( Fig. 23 ).

Clypeolabral region poorly setose, vertex glabrous, epicranial suture distinct. Antennae slender, antennomeres 2–7 clavate. Lengths of antennomeres: 3≥2≥4≥5≥6>1>7. Collum glabrous ( Fig. 23A ). Paraterga only slightly declivous, broadly rounded, and narrowly bordered ( Fig. 23A, B ). Postcollum constriction moderate ( Fig. 23A ). Tegument of metaterga shining, rough, and leather-like; prozona and metazona below paraterga smooth.Axial line barely visible both on pro- and metazona. Paraterga strongly developed, broad, subhorizontal, located in the middle of body segment in lateral view ( Fig. 23A, B ). Ozopores evident, lateral, lying in an ovoid groove at about 1/ 3 in front of caudal corner. Pore formula normal. Transverse sulcus evident reaching base of paraterga on metaterga 5–17, absent in metaterga 2–4. Stricture between pro- and metazona narrow and shallow, evidently beaded at bottom down to base of paraterga. Sterna sparsely setose, without modifications, but with a small, rounded cone between male coxae 4 ( Fig. 23C ). No conspicuous ridge in front of gonopod aperture. Legs long and slender, obviously longer than body height. Prefemora without modifications. Epiproct conical, flattened dorsoventrally, apical papillae well-developed ( Fig. 23D ). Hypoproct arch shaped.

Gonopods simple ( Figs 24 , 25 ). Coxa subcylindrical, poorly setose distodorsally ( Figs 24A, C ; 25A, C ). Prefemora densely setose, about 1/3 as long as acropodite ( Figs 24 , 25 ). Femorite slender, slightly curved and not enlarged distad, without a lateral sulcus ( Figs 24 , 25 ). Tip of femorite present one small lobe ( Figs 24A, B ; 25A, B ). Solenophore obviously bent. Anterior margin of solenophore expanded anteriorly, corona-shaped ( Figs 24 , 25 ). Tip of solenophore deeply trifid, all branches with a sharp tip. Solenomere about as long as solenophore, flagelliform ( Figs 24B, C ; 25B, C ).

Distribution. Known only from the type locality.

Figures

FIGURE 23. Polylobosoma corollifera sp. nov. holotype. A. Anterior part of body, dorsal view; B. midbody segments, dorsal view; C. Sternal cones between coxae 4, ventral view; D. Posterior part of body, dorsal view. Scale bars: A, B = 1 mm; C = 0.5 mm; D = 0.2 mm.

FIGURE 24. Right gonopod of Polylobosoma corollifera sp. nov., holotype. A. Lateral view; B. Ventral view; C. Mesal view. Scale bars: A–C = 0.25 mm.

FIGURE 25. Right gonopod of Polylobosoma corollifera sp. nov., holotype. A. Lateral view; B. Ventral view; C. Mesal view. Scale bars: A–C = 0.25 mm. Abbreviations: c, coxa; pf, prefemur; sl, solenomere; sph, solenophore.