Orthomorpha cambodjana (Attems, 1953)

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2011, Revision of the Southeast Asian millipede genus Orthomorpha Bollman, 1893, with the proposal of a new genus (Diplopoda, Polydesmida, Paradoxosomatidae), ZooKeys 131, pp. 1-161 : 54-57

Orthomorpha cambodjana (Attems, 1953) Figs 4748

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).

Lectotype.

♂ (NHMW-3501), Cambodia, Kampot Prov., Ream, Sre-Umbell, 1938-39, leg. C. Dawydoff.

Paralectotype.

1 ♀ (NHMW-3501), same locality, together with lectotype.

Lectotype designation proposed herewith is necessary to ensure the species is based on a complete male.

Redescription.

Length ca 31 mm (♂), 32 mm (♀), width of midbody pro- and metazona 2.2 and 3.4 mm (♂), 3.1 and 4.3 mm (♀), respectively (vs 3.2-4.0 mm in width, as given in the original description ( Attems 1953)). Coloration of alcohol material upon long-term preservation rather uniformly brown (Fig. 47) (vs dark castaneous with venter, legs and paraterga yellow-brown, and antennae light brown, as given in the original description ( Attems 1953)).

Head usual, clypeolabral region densely setose, surface of vertex smooth, with 1+1 setae flanking a distinct epicranial suture. Antennae rather long and slender (Fig. 47B & J), extending behind segment 3 (♂, ♀) dorsally. Head in width <collum <segments 3 and 4 <segment 2 <segments 5-16 (♂, ♀), gently and gradually tapering thereafter. Collum smooth, with three transverse rows of setae, 4+4 anterior, 2+2 intermediate, and 3+3 posterior setae; caudal corner of paraterga acutangular (ca 70°), nearly pointed (Fig. 47A & J). Tegument smooth and shining; metaterga very faintly rugulose, each postcollum one with two rows of mostly abraded, medium-sized setae: 3+3 in front row and 3+3 or, on segments 12-19, 4+4 in caudal row; prozona very finely shagreened, surface below paraterga finely microgranulate. Axial line faint, but visible, starting from collum. Paraterga very strongly developed (Fig. 47A-G & J-L), set high (at ca 1/4 metazonital height), mostly slightly upturned, all lying below dorsum, thin in lateral view, like blunt blades, a little thicker only on pore-bearing segments, on postcollum segments extending increasingly beyond rear tergal margin, nearly pointed to pointed, caudal tip on paraterga 16-19 evidently curved mesad. Calluses on paraterga 2 delimited by a sulcus only dorsally, following paraterga by a sulcus both dorsally and ventrally, rather broad. Paraterga 2 broad, anterior edge angulate, lateral edge with three small incisions in anterior half; posterior edge evidently concave (Fig. 47A, B & J). Paraterga 3 and 4 subequal, like subsequent paraterga, anterior edge broadly rounded, bordered and fused to callus, lateral edge with two small incisions. Ozopores evident, lateral, lying inside an ovoid groove at about 1/4 metazonital length. Transverse sulcus complete on metaterga 5-18, incomplete on metatergum 4, shallow, not reaching bases of paraterga, beaded at bottom, slightly sinuate anteromedially (Fig. 47A, C, F & amp; J-L). Stricture between pro- and metazona narrow, deep, ribbed at bottom down to base of paraterga. Pleurosternal carinae complete crests only on segments 2-4 (Fig. 47B, D & E), each with an evident sharp denticle caudally, thereafter increasingly strongly reduced until segment 14 (♂) or 11 (♀). Epiproct (Fig. 47E-G & L) conical, flattened dorsoventrally, apical papillae small, dentiform, directed caudoventrally; tip subtruncate; pre-apical papillae small, lying close to tip. Hypoproct (Fig. 47G) roundly subtrapeziform, setiferous knobs at caudal margin large and well-separated.

Sterna sparsely setose, without modifications, but with two large, rounded, fully separated, setose cones between ♂ coxae 4 (Fig. 47H & I). A paramedian pair of small tubercles in front of gonopod aperture. Legs long and slender, midbody ones ca 1.2-1.3 (♂) or 0.8-0.9 (♀) as long as body height, prefemora without modifications, tarsal brushes present until ♂ legs 5.

Gonopods (Fig. 48) simple. Coxa long and slender, with several setae distodorsally. Prefemur densely setose, nearly 3 times shorter than femorite + “postfemoral” part. Femorite very slender, slightly curved, very slightly enlarged distad, “postfemoral” part demarcated by an oblique lateral sulcus; tip of solenophore small, trifid, with two denticles (terminal tooth larger, middle one smaller) and a small subterminal lobule.