Hylomus namek, Nguyen & Nguyen & Nguyen & Phung, 2019

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, Zoological Studies 58 (14), pp. 1-31 : 22-25

publication ID	https://doi.org/ 10.6620/ZS.2019.58-14
DOI	https://doi.org/10.5281/zenodo.8055840
persistent identifier	https://treatment.plazi.org/id/03B987C4-FFFF-AE47-FC4E-FE58FC46AA14
treatment provided by	Valdenar
scientific name	Hylomus namek
status	sp. nov.

Treatment

Hylomus namek sp. nov.

( Figs. 1 View Fig , 26−30 View Fig View Fig View Fig View Fig View Fig ) 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 View Fig View Fig View Fig ): body generally darkish brown, but legs, paraterga and sterna paler.

Head ( Fig. 26 View Fig 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 View Fig , 27 View Fig 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 View Fig , 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 View Fig A−B) long, broadly truncated, and dorsally inflated, with two well developed lateral setiferous tubercles. Tip with four spinnerets. Hypoproct ( Fig. 28B View Fig ) 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 View Fig ).

Leg ( Fig. 27 View Fig 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 View Fig ). Tarsal brushes absent.

Gonopods ( Figs. 29−30 View Fig View Fig ) 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.