Epanerchodus coniger

Liu, Weixin & Golovatch, Sergei, 2018, The millipede genus Epanerchodus Attems, 1901 in continental China, with descriptions of seven new cavernicolous species (Diplopoda, Polydesmida, Polydesmidae), Zootaxa 4459 (1), pp. 53-84: 63-65

publication ID

https://doi.org/10.11646/zootaxa.4459.1.2

publication LSID

lsid:zoobank.org:pub:67E956AB-04B1-4EF7-8CC0-E152F95D0563

persistent identifier

http://treatment.plazi.org/id/9005EB48-4233-8E5A-48DA-FA0302D8FE1D

treatment provided by

Plazi

scientific name

Epanerchodus coniger
status

new species

Epanerchodus coniger  , new species

Figs 8–9View FIGURE 8View FIGURE 9.

Material examined: Holotype male ( SCAU eGZ6-1) from China, Guizhou Province, Bijie City, Zhijin County, Chengguan Town , Dongshan Village , Houshan Dong Cave , 12.VII.2013, colls: Mingyi Tian , Weixin Liu , Haomin Yin and Sunbin Huang   . Paratypes: 1 male, 1 female ( SCAU eGZ6-1), same data as the holotype  .

Diagnosis: Adult males of E. coniger  n. sp. are distinct from other Epanerchodus  species based on the following combination of characters: (1) sterna with a sharp cone near each coxa ( Fig. 8E View Figure ); (2) gonopod simple, with its clivus (a ridge on femorite) being very short and rounded; (3) endomere with a very small, nubbin-shaped, lateral, parabasal process and with two subapical denticles ( Fig. 9 View Figure ).

The former character is similar to that observed in E. soror  (from caves in Yunnan, China). However, E. coniger  n. sp. is distinguished by the head being narrower than the collum ( Fig. 8A View Figure ) vs. head broader than collum in E. soror  ( Fig. 20A View Figure ).

Description: Based on type specimens. Lengths of body ca 20 mm (males) or 22 mm (female), widths of pro- and metazonae 1.3 and 2.3 mm (males) or 1.8 and 2.6 mm (female). Coloration: in alcohol generally nearly pallid to light yellow-brownish. Mouthparts light grey-brown and gonopodal telopodites yellowish. Body: Adults with 20 rings. Width: head <collum <rings 2–4 <5 <6 <7–16, thereafter body gradually tapering posteriorly towards telson. Head: densely pilose, epicranial suture conspicuous ( Fig. 8B View Figure ). Antennae long, reaching past anterior margin of ring 4 when extended posteriorly, slightly clavate ( Figs 8A–B View Figure ). Exoskeleton: Collum fan-shaped, with a lateral incision on each side. Paraterga evident ( Figs 8A–E View Figure ), midbody paraterga extend metatergite to ca 1.6x width of prozonite. Paraterga on collum, rings 2–8 and 16–18 clearly upturned dorsally above a faintly convex dorsum, other paraterga flat. Caudolateral corners of paraterga strongly acute, always projecting posteriorly past tergal margin ( Figs 8A, C, D View Figure ). Anterior margin of metaterga broadered in posterior part of body, forming a shoulder ( Figs 8A, C, D View Figure ). Integument shining, translucent, prozonae very delicately alveolate. Limbus regularly denticulate. Constriction between pro- and metazonae evident, broad and smooth ( Fig. 8C View Figure ). Metatergal sculpture faint, with three irregular transverse rows of setigerous polygonal bosses. Sulcus between front and middle rows of setae a little deeper than that between middle and caudal rows. Tergal setae mostly visible, short. Three or four faint setigerous incisions at lateral margins of poreless and pore-bearing rings, respectively. Pore formula normal: 5, 7, 9, 10, 12, 13, 15–19, ozopores evident, dorsal, clearly set off from lateral margin, located between last and penultimate marginal incisions. Epiproct tip slightly concave, pre-apical lateral papillae evident ( Figs 8D–E View Figure ). Hypoproct subtrapeziform, with two setigerous papillae. Pleurosternal carinae small, present only on rings 2 and 3. Sterna sparsely setose, cross-shaped impressions shallow, with a small, but evident, sharp cone located mesocaudally to each coxa in both sexes, cones being slightly longer near posterior coxae ( Fig. 8E View Figure ). Legs long and slender ( Figs 8D–E View Figure ), about 2.0 times as long as body ring height in both sexes, devoid of sphaerotrichomes, prefemora not bulging laterally. Gonopods: simple ( Figs 8F View Figure , 9 View Figure ). Telopodite subfalcate. Prefemur densely setose and robust, about 2/3 as long as telopodite. Clivus (cl) very short and rounded. Endomere (en) at base with a very small, nubbin-like, lateral process (p). Tip of en sharp, with two subapical denticles on dorsal side. Seminal groove starting mesally, then recurving laterad to run into an accessory seminal chamber, the latter opening on a hairy pulvillus. An exomere absent.

Note: Based on the long and slender antennae and legs, and a depigmented cuticle, this species is most likely a troglobite.

Etymology: To emphasize the sterna showing a sharp cone near each coxa; noun in apposition.