LikhitrakarnNatdanaiGolovatchSergei I.PanhaSomsakRevision of the Southeast Asian millipede genus Orthomorpha Bollman, 1893, with the proposal of a new genus (Diplopoda, Polydesmida, Paradoxosomatidae) Zookeys29920112011131116110.3897/zookeys.131.1921 Orthomorpha tenuipes http://species-id.net/wiki/Orthomorpha_tenuipes (Attems, 1898)Figs 4950Prionopeltis tenuipesAttems 1898: 356 (D).Prionopeltis tenuipesAttems 1914: 204 (M).Pratinus tenuipesAttems 1937: 117 (D).Orthomorpha tenuipesJeekel 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; caudal 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.

Orthomorpha tenuipes (Attems, 1898), ♂ lectotype (A–G), ♂ from Tjibodas (H, I), ♀ from Tjibodas (J–L). A, B, J anterior part of body, dorsal, lateral and dorsal views, respectively C, D, K segments 10 and 11, dorsal, lateral and dorsal views, respectively E–F, L posterior part of body, lateral, dorsal, ventral and dorsal views, respectively H, I sternal cones between coxae 4, subcaudal and sublateral views, respectively.

Orthomorpha tenuipes (Attems, 1898), ♂ lectotype. A, B right gonopod, lateral and mesal views, respectively.

AttemsC (1898) System der Polydesmiden. I. Theil.Denkschriften der Kaiserlichen Akademie der Wissenschaften zu Wien, mathematisch-naturwissenschaftliche Classe 67: 221-482.AttemsC (1914) Die indo-australischen Myriopoden. Archiv für Naturgeschichte 80A: 1–398.AttemsC (1937) Myriapoda 3. Polydesmoidea I. Fam. Strongylosomidae. Das Tierreich 68: i-xxii, 1–300.JeekelCAW (1963) Paradoxosomatidae from Borneo (Diplopoda, Polydesmida).Tijdschrift voor Entomologie 106: 205-283.JeekelCAW (1964) A new species of Orthomorpha Bollman from Thailand observed in migration, with taxonomic notes on the genus (Diplopoda).Tijdschrift voor Entomologie 107: 355-364JeekelCAW (1968) On the classification and geographical distribution of the family Paradoxosomatidae (Diplopoda, Polydesmida).Academisch Proefschrift, Rotterdam, 162 pp.GolovatchSI (1998) On several new or poorly-known Oriental Paradoxosomatidae (Diplopoda Polydesmida), VI. Arthropoda Selecta 6(3–4): 35–46. [for 1997]