Review of Dragon Millipedes (Diplopoda, Polydesmida, Paradoxosomatidae) in the Fauna of Vietnam, with Descriptions of Three New Species Author Nguyen, Anh D. Author Nguyen, Manh-Ha Author Nguyen, Thu-Anh T. Author Phung, Hong-Luong T. text Zoological Studies 2019 2019-07-12 58 14 1 31 journal article 56108 10.6620/ZS.2019.58-14 de0647eb-9b73-4bac-9ff7-f7bff7518dc0 PMC6759935 31966315 8065869 Key to species of the genus Hylomus species in Vietnam 1 . Paraterga wing-shaped ........................................... H. spectabilis - Paraterga antler- or spine-shaped ( Figs. 3 , 7 , 9 , 11 ) ................... 2 2 . Paraterga antler-shaped ( Figs. 3 , 7 , 11 ) ...................................... 3 - Paraterga spine-shaped ( Fig. 9 ) ................................................ 11 3. Epiproct unmodified, without conspicuous setiferous knobs near tip ( Fig. 18 A−B) ......................................................................... 4 - Epiproct modified, with several evident setiferous knobs near tip ( Figs. 7F , 28B )............................................................................ 7 4. Metaterga smooth, more or less shining. Male femora unmodified ......................................................................................... H. asper - Metaterga rough, dull, granular. Male femora modified, inflated. ..................................................................................................... 5 5 . Metaterga with more than 4 + 4 posterior setiferous spines on midbody segments ( Fig. 17A ). Body pale or weakly pigmented. Lamina lateralis of gonopod solenophore with densely setose region ( Figs. 19−20 ) ................................................... H. songoku Fig. 27. Hylomus namek sp. nov. from Ha Giang Province. Holotype. Segment 9, dorsal view (A). Segment 13, dorsal view (B). Posterior part, lateral view (E), ventral view (F). Scale bar = 1 mm. © 2019 Academia Sinica, Taiwan - Metaterga with less than 4 + 4 posterior setiferous spines on midbody segments. Body pigmented. Lamina lateralis of gonopos solenophore without densely setose region ................................ 9 6. Metaterga with 3 + 3 posterior setiferous spines. Male femora 6, 7 and 9 humped ventrally. Fifth sternum with a pair of tubercles between coxae 4 ....................................................... H. cervarius - Metaterga with 2 + 2 posterior setiferous spines. Male femora 6 and 7, sometime femur 5 modified, each with a large hump on ventral side. Fifth sternum with either rectangular process or bifid trapeziform lamina between coxae 4.......................................... 7 7. Body light or darkish brown. Fifth sternum with a bifid trapeziform lamina between coxae 4.......................................... 8 - Body reddish or pinkish. Fifth sternum with four round tubercles on a prominent, elevated, rectangular lamina between male coxae 4 .................................................................................. H. enghoffi 8. Male femora 6, 7 humped ventrally ( Fig. 28D ). Tip of solenophore broadly rounded lobuliform ( Figs. 29−30 ) ............... ........................................................................................ H. namek - Male femora 6, 7, sometimes 5, humped ventrally ( Fig. 23B ). Tip of solenophore acute ( Figs. 24−25 ) ............................. H. saiyans 9. At least 3 + 3 posterior metatergal spines on metaterga........... 10 - Only 1 + 1 posterior poor setae on metaterga ( Fig. 3B, D ) ........... ............................................................................... H. cattienensis 10. Colour pink to red. Metaterga with numerous microsetae, and 4 + 4 posterior spines ( Fig. 4A, B, D, E ) ............................ H. pilosus - Colour dark to castaneous brown. Metaterga with microgranulation, and 3 + 3 posterior spines ............ H. proximus 11. A row of 1 + 1 posterior spines on metaterga. Gonopod subfalcate, femorite slightly curved; solenomere long .................. .................................................................................... H. specialis - A row of 2 + 2 posterior tubercles/spines on metaterga. Gonopod falcate; solenophore short, pointed terminally ......................... 12 12. Fifth sternum with two independent setiferous tubercles between coxae 4. Antenna long and slender.............................. H. grandis - Fifth sternum with a bifid setiferous trapeziform lamina between coxae 4. Antenna short and stout ( Fig. 9B ) ................... H. holstii