Hylomus namek Nguyen & Nguyen & Nguyen & Phung 2019, sp. nov.
Creators: name: Nguyen, Anh D.
name: Nguyen, Manh-Ha
name: Nguyen, Thu-Anh T.
name: Phung, Hong-Luong T.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Polydesmida
Paradoxosomatidae
Hylomus
Hylomus namek

description: Hylomus namek sp. nov.
(Figs. 1, 26−30) urn:lsid:zoobank.org:act: AEDAF341-76F4-4D37-BB94- 3F564724CDCB
Material examined: Holotype: male (IEBR-Myr 514H) Ha Giang Province, Bac Quang District, Duc Xuan commune, Na Po village, limestone forest, 14−15 April 2013, coll. Anh D. Nguyen. Paratypes: 1 male, 2 females (IEBR-Myr 514P) same data as holotype.
Etymology: The name refers to the planet “namek”, a home of the dragon balls, in the Japanese manga “Dragon Ball” by Toriyama Akira (Japan).
Diagnosis: The species is diagnosed by paraterga being antler-shaped; metaterga with two rows of setiferous spines; gonopod erect; femorite and postfemoral region subequal in length; tip of gonopod broadly rounded lobuliform.
Description: Length ca. 16.0− 17.4 mm (male), 20.2−23.4 mm (female); width of midbody pro- and metazonae 0.7−0.9 mm (male), 1.5−1.6 mm (female) and 0.9−1.1 mm (male), 1.6−1.9 mm (female), respectively. Holotype length ca. 16.0 mm, width of midbody pro- and metazonae 0.9 mm and 1.1 mm, respectively.
Colouration (Figs. 26−28): body generally darkish brown, but legs, paraterga and sterna paler.
Head (Fig. 26 A−C) slightly broader than collum in width. Clypeolabral region densely setose. Epicranial suture clearly distinct, divided frons into two equal, slightly convex parts. Frons with dense setiferous microgranulations. Antennae slender, extremely long, reaching segment 9 or 10 if stretched posteriorly. Antennomere 3> 4 = 5> 2> 6> 1> 7; antennomere 7 blackish, with four sensory cones at tip.
Collum subequal to segment 2 in width, semicircular; surface shining and with dense setiferous microgranulations, and with three rows of well-developed setiferous spines: 3 + 3 anterior, 1 + 1 intermediate and 2 + 2 posterior. Paraterga antler-shaped with three branches, highly elevated from dorsum.
Body submoniliform, segments 2−16 subequal in width, thereafter gradually tapering towards telson. Prozonae faintly micro-alveolate and shagreened. Metazonae with dense setiferous microgranulations. Metaterga (Figs. 26D, 27 A−B) with two rows of well-developed setiferous spines: 2 + 2 anterior and 1 + 1 posterior on segments 2−5, 2 + 2 anterior and 2 + 1 posterior on segment 6, 2 + 2 anterior and 2 + 2 posterior on segments 7−17, 2 + 2 anterior and 3 + 3 posterior on segments 18−19; the posterior spines much developed than anterior ones.
Paraterga (Fig. 26A, C−D) well developed, antler-shaped, highly elevated from metatergal surface, with four branches (one main branch, two anterior ones and a largest one located posteriorly at base of paraterga). Paraterga slightly directed caudad. Ozopore on segments 5, 7, 9−10, 12−13 and 15−19, lying at base of the second branch, and visible from dorsal view. Transverse sulcus incomplete, starting on metatergum 5. Pleurosternal carinae absent. Axial line thin, line-shaped but clearly distinct.
Epiproct (Fig. 28 A−B) long, broadly truncated, and dorsally inflated, with two well developed lateral setiferous tubercles. Tip with four spinnerets. Hypoproct (Fig. 28B) triangular, with two well separated, distolateral, setiferous knobs.
Sterna densely setose, longitudinal sulcus thin whereas transverse sulcus broader, deep and distinct, without modifications except a setiferous bifid trapeziform process between coxae 4 (Fig. 28C).
Leg (Fig. 27 C−D) slender and extremely long, ca. 3−3.5 times as long as midbody height. Prefemora not swollen. Femora 5 and 6 with a ventral hump (Fig. 28D). Tarsal brushes absent.
Gonopods (Figs. 29−30) simple. Coxite cylindrical, subequal to femorite in length; ventrodistal part sparsely setose. Prefemorite densely setose, laterally separated from femorite by oblique sulcus. Femorite and postfemoral region subequal in length, weakly constricted at middle, without modifications. No demarcation between femorite and postfemoral region. Solenomere flagelliform, partly sheathed by well-developed solenophore. Seminal groove running entirely mesally, directed distodorsad before entering the solenophore. Tip of solenophore broadly rounded lobuliform.
description: Published as part of Nguyen, Anh D., Nguyen, Manh-Ha, Nguyen, Thu-Anh T. & Phung, Hong-Luong T., 2019, Review of Dragon Millipedes (Diplopoda, Polydesmida, Paradoxosomatidae) in the Fauna of Vietnam, with Descriptions of Three New Species, pp. 1-31 in Zoological Studies 58 (14) on pages 22-25, DOI: 10.6620/ZS.2019.58-14, http://zenodo.org/record/8065869