Epanerchodus wuxi, 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 : 77

publication ID	https://doi.org/ 10.11646/zootaxa.5257.1.6
publication LSID	lsid:zoobank.org:pub:E18CE51E-CCD2-4E12-B480-930C79D8B745
DOI	https://doi.org/10.5281/zenodo.7765949
persistent identifier	https://treatment.plazi.org/id/03B087C8-0719-441A-3ACF-1BDBD948CC00
treatment provided by	Plazi
scientific name	Epanerchodus wuxi
status	sp. nov.

Treatment

Epanerchodus wuxi sp. nov.

Figs 32–34 View FIGURE 32 View FIGURE 33 View FIGURE 34

Type materials. Holotype Male: China, Chongqing, Wuxi County, Yintiaoling National Nature Reserve , Hongqi , Longtan Cave , 31°30’40.73” N, 109°49’40.93” E, alt. 1677 m, 14 August 2022, X.K. Jiang & H.M. Chen leg. GoogleMaps Paratypes: 12 females, same data as holotype GoogleMaps ; 1 male, a manual tunnel near the Longtandong Cave , 31°31’16.83” N, 109°49’51.84” E, alt. 1458 m, same time and collectors as holotype GoogleMaps ; 1 female, same cave as holotype, 11 August 2022, Q.D. Zhu leg.

Etymology. The specific name is a noun in apposition, derived from the type locality, Wuxi County.

Diagnosis. The new species is similar to Epanerchodus latus Liu & Golovatch, 2018 in having the gonopodal femorite with a finger-shaped process distally and a process medially, the endomere carrying a subapical lobe, but distinguished by the broad subapical endomere with a spiny process and a row of apical denticles ( Fig. 34 View FIGURE 34 ).

Description: Length of holotype 22 mm, male paratypes 22 mm, female paratypes 20–37 mm; width of midbody pro- and metazona in holotype 1.6 mm and 3.1 mm, respectively, another male paratype 1.5 mm and 3.0 mm, in female paratypes up to 1.2–1.9 mm and 2.4–3.5 mm. Live specimens whitish to light yellow and semitransparent ( Fig. 32A View FIGURE 32 ), in alcohol light yellow to light brown ( Figs 32B, C View FIGURE 32 , 33 View FIGURE 33 ).

Adults with 20 segments. Width of holotype: head (1.8) << collum (2.7) <segment 2 (2.8) = 3 = 4 = 5 <6 (2.9)– 8 <9 (3.1) –16, thereafter segments 17 (2.9)–19 (1.7). Body gradually tapering posteriorly towards telson ( Figs 32 View FIGURE 32 , 33 View FIGURE 33 ). Head covered with sparse pubescence throughout, vertigial sulcus apparent ( Figs 32A, B View FIGURE 32 ; 33A, C View FIGURE 33 ). Antennae long and slender, clavate, in situ reaching behind segment 4. Collum fan-shaped, with irregular sparse setae, and a faint lateral incision/denticle on each side ( Figs 32A, B View FIGURE 32 ; 33C View FIGURE 33 ). Paraterga distinct and broad ( Figs 32 View FIGURE 32 , 33 View FIGURE 33 ), midbody metaterga about 1.9 times as wide as prozonae. All paraterga slightly upturned dorsally above a faintly convex dorsum ( Fig. 32 View FIGURE 32 ). Anterior edge of metaterga forming a shoulder ( Figs 32 View FIGURE 32 , 33 View FIGURE 33 ). Caudolateral corners of paraterga from rings 2 protruded toward back-inner past tergal margin, subsequent ones acuminate, especially on rings 18–19 ( Figs 32 View FIGURE 32 , 33 View FIGURE 33 ). Integument shining, translucent, prozonae very delicately alveolate ( Figs 32 View FIGURE 32 , 33C View FIGURE 33 ). Three or four notches at lateral margins of paraterga ( Figs 32 View FIGURE 32 , 33 View FIGURE 33 ). Constriction between pro- and metazonae narrow, shallow and smooth ( Fig. 32 View FIGURE 32 ). Metatergal sculpture faint, with three irregular transverse rows of setigerous polygonal bosses ( Fig. 32 View FIGURE 32 ). Sulcus between front and middle rows of setae a little deeper than that between middle and caudal rows ( Fig. 32 View FIGURE 32 ). Tergal setae very short, sparse.

Pore formula normal: 5, 7, 9, 10, 12, 13, 15–19. Ozopores large and evident, located between last and penultimate marginal incisions. Epiproct short, conical, slightly surpassing paraprocts caudally, pre-apical lateral papillae small, with two long setae ( Fig. 32C View FIGURE 32 ). Hypoproct lunate, with two setigerous conical papillae at caudal margin ( Fig. 33B, C View FIGURE 33 ). Sterna sparsely setose, cross-shaped impressions shallow ( Fig. 33A, B View FIGURE 33 ). Legs long and slender, about 2.0 times as long as body ring height.

Coxa of gonopod ( Fig. 34 View FIGURE 34 ) large and squarish, as usual. Prefemur densely setose and nearly half the length of telopodite. Femorite with a clivus (cl), a process (p2) medially and a finger-shaped process (p1) distally. Endomere (en) strongly curved, broad subapical, with a small subapical curved lobe (l), a row of apical denticles (d) and a spiny protuberance medially (sp). Seminal groove starting mesally, distally recurved laterad near base of p1, then run into an accessory seminal chamber, the latter opening on a hairy pulvillus, which makes a clear-cut distolateral loop. Exomere absent.

Distribution. Known only from the type locality, Wuxi, Chongqing, China.