Review of the millipede genus Orthomorpha Bollman, 1893 (Diplopoda, Polydesmida, Paradoxosomatidae) in Vietnam, with several new records and descriptions of two new species Author Likhitrakarn, Natdanai Author Golovatch, Sergei I. Author Semenyuk, Irina Author Efeykin, Boris D. Author Panha, Somsak text ZooKeys 2019 898 121 158 http://dx.doi.org/10.3897/zookeys.898.39265 journal article http://dx.doi.org/10.3897/zookeys.898.39265 1313-2970-898-121 9B537DC38DB9459E97717687AFA19244 2A2FB0D263AA5E498C5C85EA4031053A Orthomorpha scabra Jeekel, 1964 Figs 6 , 7 , 8 Pratinus granosus Attems, 1953: 166 (D). Orthomorpha granosa - Jeekel 1963 : 265 (M). Orthomorpha scabra Jeekel, 1964: 361 (N, D). Renamed by Jeekel (1964) to avoid homonymy. Orthomorpha scabra - Jeekel 1968 : 56 (M); Hoffman 1977 : 700 (M); Golovatch 1998 : 42 (M, D); Likhitrakarn et al. 2011 : 58 (D). Old records. Vietnam, Lam Dong Province, Peak Lang Biang; Laos, Luang Prabang Province, Luang Prabang; Xiang Khouang Province, Xieng Khouang ( Attems 1953 ). New material examined. 1 ♂ (ZMUM Rd 4202), Vietnam, Gia Lai Province, Kon Ka Kinh National Park, forest around headquarters, 14°13'12"N , 108°19'54"E , 1,400 m a.s.l., mixed tropical forest on hill slope, under log, daytime, 26.V.2017; 2 ♂ (ZMUM Rd 4213), same locality, but near the village of Krong, 14°17'46"N , 108°26'41"E , 800 m a.s.l., disturbed tropical forest on hills with bamboo, on bushes, daytime, 18.V.2017; 3 ♀ (ZMUM), same locality, 14°18'59"N , 108°26'26"E , 750 m a.s.l., mixed tropical forest on slopes, on tree trunk, daytime, 9.05.2017; 2 ♂ (ZMUM), Vietnam, Lam Dong Province, Bidoup Nui Ba National Park, forest near Giang Ly ranger station, 12°10'23"N , 108°40'59"E , 1,550 m a.sl., mixed forest on slopes, in Asplenium nidus , daytime, 11.I.2018; 2 ♀ (ZMUM), same locality, mixed forest, 12°11'59"N , 108°40'34"E , 1,500 m a.s.l., on log, daytime, 13.I.2018; 3 ♂, 2 ♀ (ZMUM), same locality, 12°11'09"N , 108°40'43"E , 1,430 m a.s.l., mixed forest in the river valley, on forest floor, night time, 12 & 14.VI.2018, all leg. I. Semenyuk. Descriptive notes. Length 26-46 mm (♂) or 21.5-42 mm (♀), width of midbody pro- and metazonae 2.4-4.0 and 3.6-5.8 mm (♂) or 3.5-4.2 and 3.7-6.2 mm (♀), respectively. Colouration of live animals ( Fig. 6A ) black-brownish with contrasting dark yellow to orange paraterga and epiproct, head and antennae brownish, legs pale brownish; colouration in alcohol, after one year of preservation, faded to black-brown ( Fig. 6 B-H ), paraterga and epiproct pale whitish yellow or pale brown, legs whitish to pale brown distally. Figure 6. Orthomorpha scabra Jeekel, 1964, ♂ from Kon Ka Kinh National Park A habitus and live colouration B, C anterior part of body, lateral and dorsal views, respectively D, E segments 10 and 11, dorsal and lateral views, respectively F-H posterior part of body, dorsal, ventral and lateral views, respectively I, J sternal cones between coxae 4, subcaudal and sublateral views, respectively. Remarks. This species has recently been redescribed ( Likhitrakarn et al. 2011 ), based on type material. The new specimens agree nearly fully with the available descriptions except for the ♂ tarsal brushes being present until legs 7 or 8 vs. legs 5. One variety, grandis var. nov., is more disjunct morphologically, but not genetically, being treated separately below. Figure 7. Orthomorpha scabra Jeekel, 1964, left gonopod A, B mesal and lateral views, respectively. Scale bar: 0.5 mm. This species seems to be widespread, occurring in Vietnam and northern Laos ( Fig. 19 ), and in two places it was found coexisting with O. rotundicollis (Attems, 1937) (see also above). According to IS' field observations, the millipedes occupy a wide range of habitats, including riparian forests with flooding occurring every year and non-flooding mixed forests on slopes. They also appear in a forestless farm area, usually being found on the forest floor and at bases of tree trunks. They occupy many microhabitats in lower forest strata. The activity is mainly restricted to the night time, but some individuals keep it up in daylight as well. Figure 8. Orthomorpha scabra Jeekel, 1964, left gonopod A, B lateral and mesal views, respectively C-F distal part, sublateral, subcaudal, caudal and oral views, respectively.