Orthomorpha cambodjana (Attems, 1953)

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2014, The millipede genus Orthomorpha Bollman, 1893 in Laos (Diplopoda, Polydesmida, Paradoxosomatidae), with descriptions of new species, ZooKeys 374, pp. 1-22 : 6-7

Orthomorpha cambodjana (Attems, 1953) Figs 4-6

Pratinus cambodjanus Attems 1953: 168 (D).

Orthomorpha cambodjana - Jeekel 1963: 265 (M); 1964: 361 (M, D); 1968: 56 (M); Hoffman 1977: 700 (M); Golovatch 1998: 42 (M, D); Likhitrakarn et al. 2011: 66 (D).

Material examined.

2 ♂ (CUMZ), Laos, Attapu Province, Xaysetha District, Ban Kasom, 116 m a.s.l., 15°06'27"N, 106°51'14"E, 16.10.2013, leg. C. Sutcharit and W. Siriwut.

Descriptive notes.

Length 32-35 mm (♂), width of midbody pro- and metazona 2.6-2.7 and 3.8-3.9 mm (♂), respectively.

Coloration in alcohol, after one month of preservation, blackish (Fig. 4 A–F), paraterga and epiproct light yellow to whitish yellow; venter, legs and antennae whitish to pale brown distally (Fig. 4 A–I).

Antennae reaching segment 3 when stretched dorsally. Paraterga very strongly developed (Fig. 4 A–G), anterolateral edge clearly convex. Calluses on paraterga 2 and 3 delimited by a sulcus only dorsally, following paraterga by a sulcus both dorsally and ventrally, strongly bordered. Pleurosternal carinae complete crests only in segment 2 (Fig. 4B, D, E), a small, sharp, caudal tooth in segments 3-7, a very faint tubercle until segment 15. Legs long and slender, midbody ones ca 1.1-1.3 times as long as body height, prefemora without modifications, tarsal brushes present until ♂ leg 7.

Gonopod solenophore with a tridentate tip (Figs 5, 6), dorsalmost prong being subacuminate, longer than both others, whereas middle denticle shortest and pointed.

Remarks.

This species has hitherto been known only from a ♂ lectotype and a ♀ paralectotype, currently both rather strongly faded, taken at Sre-Umbell, Kampot Province, southern Cambodia ( Attems 1953, Likhitrakarn et al. 2011). The above fresh samples show only slight variations, mainly a darker coloration, as opposed to the types which have recently been redescribed in due detail ( Likhitrakarn et al. 2011). This species is thus new to the fauna of Laos, suggesting a far wider distribution in Indochina.