Epanerchodus bishou, Liu & Huo, 2020

Liu, Weixin & Huo, Qingbo, 2020, Two new species and a new record of polydesmoid millipedes from Jiangsu and Zhejiang provinces, eastern China (Diplopoda, Polydesmida), Zootaxa 4722 (1), pp. 41-49 : 46-48

publication ID

https://doi.org/ 10.11646/zootaxa.4722.1.3

publication LSID

lsid:zoobank.org:pub:206172F4-B350-4AE0-940E-B21CE2D7AD1C

DOI

https://doi.org/10.5281/zenodo.5920293

persistent identifier

https://treatment.plazi.org/id/4728879D-1A14-280C-05FF-5060947C348F

treatment provided by

Plazi

scientific name

Epanerchodus bishou
status

sp. nov.

Epanerchodus bishou View in CoL , new species

Figs 7–8 View FIGURE 7 View FIGURE 8

Type material: Holotype male ( SCAU), China, Zhejiang Province, Tianmu Mountain Nature Reserve , 30°19.931’N, 119°26.27’E, 502 m a.s.l., 2018-X-12, Qing-Bo Huo leg. GoogleMaps Paratypes: 1 male ( SCAU), same locality and data as holotype GoogleMaps . 1 male, 1 female ( SCAU), same province, Kaihua County, Gutian , 29°14.787′N, 118°7.496′E, 435 m a.s.l., 2018-X-9, Qing-Bo Huo, Peng Gao leg. GoogleMaps

Etymology: This species epithet, bishou in Chinese meaning “dagger”, is used as a noun in apposition and emphasizes the gonopodal femorite with a prominent, long, dagger-shaped process.

Diagnosis: Adult males of E. bishou n. sp. are distinct from other Epanerchodus species by the following combination of characters: (1) broad paraterga (widths of pro- and metazonae 1.6–1.8 and 3.5–3.8 mm, respectively) ( Figs 7B, E, H View FIGURE 7 ); (2) male tibiae and tarsi with sphaerotrichomes ( Fig. 8A View FIGURE 8 ); (3) gonopodal femorite with a prominent, long, dagger-shaped process distally and a curved finger-shaped process medially; (4) endomere tip unequally bifid ( Fig. 8 View FIGURE 8 ).

The new species seems to be particularly similar to E. sphaerisetosus (from Jinhua in Zhejiang, China), but is distinguished by (1) caudolateral corners of paraterga being square ( Fig. 6E View FIGURE 6 ) vs. acute-angled in E. sphaerisetosus ; (2) exomere absent ( Fig. 8 View FIGURE 8 ) vs. exomere present in E. sphaerisetosus .

Description: Based on type specimens. Lengths of both sexes ca. 16–19 mm, widths of pro- and metazonae 1.6–1.8 and 3.5–3.8 mm, respectively.

Coloration: generally yellow brownish to dark brownish ( Fig. 7 View FIGURE 7 ).

Body: Adults with 20 rings. Width: head <collum <ring 2 <3 <4 <5–15, thereafter (rings 16–19) body gradually tapering towards telson.

Head: densely setose, epicranial suture conspicuous ( Fig. 7A View FIGURE 7 ). Antennae long, reaching past middle of ring 3 when extended posteriorly, slightly clavate ( Figs 7 View FIGURE 7 A–C).

Exoskeleton: Collum transversely semi-lunar, with three transverse rows of 4+4 setae and a faint lateral incision/denticle on each side. Paraterga broad ( Figs 7 View FIGURE 7 A–H), midbody paraterga ca. 2.0–2.2x prozonite width. Paraterga 2–3 slightly upturned dorsally above a faintly convex dorsum, following paraterga flat and subhorizontal ( Figs. 7A, D, G View FIGURE 7 ). Caudolateral corners of paraterga nearly square, slightly projecting posteriorly past tergal margin, clearly acute only on rings 17–19 ( Figs 7 View FIGURE 7 G–H). Integument shining ( Fig. 7 View FIGURE 7 ), prozonae delicately alveolate. Limbus regularly denticulate ( Figs 7A, D View FIGURE 7 ). Constriction between pro- and metazonae narrow, shallow and smooth ( Figs 7B, E, H View FIGURE 7 ). Metatergal sculpture faint, with three irregular transverse rows of 3+3 setigerous polygonal bosses. Sulcus between front and middle rows of setae a little deeper than that between middle and caudal rows ( Figs 7B, E, H View FIGURE 7 ). Tergal setae very short, present on rings 18–19. Three or four faint setigerous incisions at lateral margins of poreless and porebearing rings, respectively. Pore formula normal: 5, 7, 9, 10, 12, 13, 15–19, ozopores evident, dorsal, clearly set off from lateral margin and located between last and penultimate marginal incisions ( Figs 7B, E, H View FIGURE 7 ). Epiproct short, conical, pre-apical lateral papillae evident. Hypoproct subtrapeziform, with two setigerous papillae ( Figs 7 View FIGURE 7 F–H). Pleurosternal carinae present only on ring 2 in both sexes. Sterna sparsely setose, cross-shaped impressions (both axial and transverse) shallow, clearly broadened between male coxae 7 and 9 ( Fig. 7C View FIGURE 7 ).

Legs: long, but stout, about 1.5 (male) or 1.2 (female) times as long as body height, prefemora not bulging laterally; sphaerotrichomes easily visible ventrally on tibiae and tarsi ( Fig. 7A View FIGURE 7 ).

Gonopods: ( Figs 7C, I View FIGURE 7 , 8 View FIGURE 8 A–B) Coxa large and squarish, densely setose laterally and with a long seta mesally. Prefemur densely setose and nearly half the length of telopodite. Clivus, or distolateral ridge on femorite, short; femorite with a prominent, long, dagger-shaped process (p1) distally and a curved finger-shaped process (p2) medially, the latter carrying a very small tooth (t) at midway. Endomere (en) curved, unequally bifid, tip of longer branch slightly folded. Seminal groove (sg) starting mesally, distally recurved laterad near base of p2, then turning laterobasad to run into an accessory seminal chamber, the latter opening on a hairy pulvillus. An exomere absent.

Remark: Tianmu Mountains is known to be the type locality of four other Diplopoda (Golovatch and Liu, unpublished data).

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