Orthomorpha unicolor Attems, 1930

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 : 45-46

Orthomorpha unicolor Attems, 1930 Figs 3940

Orthomorpha hydrobiologica var. unicolor Attems 1930a: 122 (D).

Orthomorpha hydrobiologica var. unicolor - Attems 1937: 64 (D).

Orthomorpha unicolor - Jeekel 1963: 265 (M); 1964: 361 (M); 1968: 45 (M); Hoffman 1973: 362 (M); 1977: 700 (M); Golovatch 1998: 42 (D, M).

Holotype.

♂ (NHMW-3508), Indonesia, central Java, Sarangan, 09.12.1928, leg. A. F. Thienemann & H. J. Feuerborn.

Redescription.

Length ca 29 mm, width of midbody pro- and metazona 2.2 and 3.3 mm, respectively. Coloration of alcohol material upon long-term preservation rather uniformly brown (Fig. 39) (vs very dark brown, as given in the original description ( Attems 1930a)).

All other characters as in Orthomorpha hydrobiologica , except as follows.

Collum with three transverse rows of setae, 4+4 anterior, 2+2 intermediate, and 2+2 posterior setae; caudal corner of paraterga subrectangular, narrowly rounded (Fig. 39A & B). Postcollum metaterga with two transverse rows of setae traceable as insertion points: 2+2 in anterior (pre-sulcus) row, 4+4 in posterior (postsulcus) one, the latter borne on small tubercles. Paraterga strongly developed (Fig. 39A-G), mostly subhorizontal and lying below dorsum, on postcollum segments extending increasingly beyond rear tergal margin, always pointed, on segments 16-19 tips strongly curved mesad. Calluses on all paraterga delimited by a sulcus only dorsally, rather broad, especially so on pore-bearing segments. Paraterga 2 broad, anterior edge rounded, lateral edge with only one small incision near midway (Fig. 39A). Transverse sulcus complete on metaterga 5-18, shallow, not reaching bases of paraterga, ribbed at bottom, slightly sinuate anteromedially (Fig. 39A, C & F). Pleurosternal carinae complete crests only on segments 2-4 (Fig. 39B), each with an evident sharp denticle caudally, thereafter increasingly strongly reduced until segment 10.

Sterna sparsely setose, with neither modifications nor knobs between ♂ coxae 4 (Fig. 39H & I). Gonopod aperture damaged during removal of gonopods. Legs long and slender, midbody ones ca 1.3-1.4 times as long as body height, prefemora without modifications, tarsal brushes present until ♂ legs 10.

Gonopods (Fig. 40) with prefemur enlarged, about 2 times shorter than femorite + “postfemoral” part.

Remarks.

This variety was elevated to a full species by ( Jeekel (1963, 1964, 1968), also treated as such by Hoffman (1973) and Golovatch (1998).