Orthomorpha tenuipes (Attems, 1898)

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 : 57-60

Orthomorpha tenuipes (Attems, 1898) Figs 4950

Prionopeltis tenuipes Attems 1898: 356 (D).

Prionopeltis tenuipes - Attems 1914: 204 (M).

Pratinus tenuipes - Attems 1937: 117 (D).

Orthomorpha tenuipes - Jeekel 1963: 265 (M); 1964: 361 (M, D); 1968: 45 (M); Golovatch 1998: 42 (D, M).

Lectotype.

♂ (NHMW-3518), Indonesia, eastern Java, Tengger Mountains, no date, leg. H. Fruhsdorfer.

Non-type material.

1 ♂, 6 ♀ (NHMW-7998); 1 ♂, 1 ♀ (NHMW-7999); 8 ♂, 15 ♀ (NHMW-8003), Indonesia, Java, Tjibodas, 1897, leg. H. A. Möller, det. Attems. 4 ♂, 1 ♀ (NHMW-8002), Indonesia, Java, no date, leg. T. H. Adensamer, det. C. Attems.

Lectotype designation proposed herewith is necessary to ensure the species is based on a complete male, because the type series was stated to have been shared between the collections of the Berlin and Vienna museums ( Attems 1898).

Redescription.

Length 24-28 mm (♂), 29-33 mm (♀), width of midbody pro- and metazona 2.6-2.8 and 3.4-4.1 mm (♂), 3.3-3.7 and 4.5-5.1 mm (♀), respectively (vs 40 mm in length and 4.0 mm in width, as given in the available descriptions ( Attems 1898, 1937)). Lectotype ca 26 mm long, 1.7 and 3.4 mm wide on midbody pro- and metazona, respectively. Coloration of alcohol material upon long-term preservation mostly grey-brown (Fig. 49) with contrasting yellowish paraterga and epiproct, and light brown venter and legs (vs dark castaneous brown with paraterga and epiproct yellow, and venter and legs light red-brown, as given in the descriptions ( Attems 1898, 1937)).

Head usual, clypeolabral region sparsely setose, surface of vertex smooth and bare, epicranial suture distinct. Antennae rather long and slender (Fig. 49B & J), extending behind almost to end of segment 3 (♂) or reaching segment 3 (♀) dorsally. Head in width <collum <segment 3 <2 <4 <5-16 (♂), or head <collum <segments 3 and 4 <2 <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; cau dal corner of paraterga subrectangular, narrowly rounded (Fig. 49A, B & J). Tegument smooth and shining; metaterga very faintly rugulose, each postcollum one with two rows of fully abraded setae traceable only as insertion points: 2+2 in front row and 3+3 or, on several caudal segments, 4+4, in caudal row, these borne on indistinct, truncate, very low tubercles; prozona very finely shagreened, surface below paraterga finely microgranulate. Axial line faint, but visible, starting from collum. Paraterga very strongly developed (Fig. 49A-G & J-L), set high (at ca 1/4 metazonital height), subhorizontal to slightly upturned, lying below dorsum on segments 2-6 and 19, above dorsum on segments 7-18, rather thick in lateral view, a little thicker on pore-bearing segments, on postcollum segments extending increasingly beyond rear tergal margin starting only from segment 5 or 6 (♂) or midbody segments (♀), narrowly rounded to pointed, caudal tip on paraterga 16-19 evidently curved mesad. Calluses on paraterga delimited by a sulcus only dorsally, broad. Paraterga 2 broad, anterior edge broadly rounded, lateral edge with three minute incisions in anterior half; posterior edge evidently concave (Fig. 49A, B & J). Paraterga 3 and 4 subequal, like subsequent paraterga, anterior edge broadly rounded, bordered and fused to callus, lateral edge with two minute incisions. Ozopores not too evident, ventrolateral, not lying inside a groove, placed at about 1/3 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. 49A, C, F & J-L). Stricture between pro- and metazona rather wide, shallow, ribbed at bottom down to base of paraterga. Pleurosternal carinae complete crests only on segments 2-7(8) (♂) or 2-4 (♀) (Fig. 49B, D & E), each with an evident sharp denticle caudally, thereafter increasingly strongly reduced until segment 16 (♂) or 15 (♀). Epiproct (Fig. 49E-G & L) conical, flattened dorsoventrally, apical papillae small, dentiform, directed caudoventrally; tip subtruncate; pre-apical papillae small, lying close to tip. Hypoproct (Fig. 49G) subtrapeziform, setiferous knobs at caudal margin small and well-separated.

Sterna sparsely setose, without modifications, but with two small, rounded, fully separated, but subcontiguous, setose cones between ♂ coxae 4 (Fig. 49H & I). A paramedian pair of evident tubercles in front of gonopod aperture. Legs long and slender, midbody ones ca 1.2-1.4 (♂) or 0.8-1.0 (♀) as long as midbody height, prefemora without modifications, tarsal brushes present until ♂ legs 7.

Gonopods (Fig. 50) simple. Coxa long and slender, with several setae distodorsally. Prefemur rather large, densely setose, nearly 2 times shorter than femorite + ”postfemoral” part. Femorite very slender, evidently curved, nearly not enlarged distad, “postfemoral” part demarcated by an oblique lateral sulcus; tip of solenophore small, trifid, with two subequal denticles (terminal and subterminal) and a minute prong in-between.