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 fluminoris http://species-id.net/wiki/Orthomorpha_fluminoris Hoffman, 1977Figs 5556Orthomorpha fluminorisHoffman 1977: 701 (D).Orthomorpha fluminorisGolovatch 1998: 42 (D, M).Holotype.

♂ (MHNG), Malaysia, environs of Kuala Lumpur, Batu Caves, 24.02.1975, leg. P. Strinati.

Redescription.

Length 39 mm, width of midbody pro- and metazona 2.9 and 4.4 mm, respectively. Coloration of alcohol material upon long-term preservation dark castaneous brown with contrasting yellowish paraterga; venter, legs yellownish and tip of epiproct light red-brown, antennae also light red-brown, but antenomere 6 slightly infuscate, brownish, antenomere 7 dark brown, and tip of antennae pallid (Fig. 55).

Clypeolabral region densely setose, vertex sparsely so, epicranial suture distinct. Antennae rather short, clavate (antennomere 6 broadest), extending behind body segment 2 dorsally. Head in width < collum < segment 2 < 3 < 4 < 5–16; thereafter body gently and gradually tapering. Collum with three transverse rows of setae, 4+4 anterior, 2+2 intermediate, and 3+3 posterior; caudal corner of paraterga nearly pointed, slightly declined ventrally and continuing collum’s convexity (Fig. 55A & B); paraterga acutangular (ca 50°), slightly extending behind tergal margin, posterior edge slightly concave (Fig. 55A & B). Tegument smooth and poorly shining, prozona very finely shagreened, metazona leathery, rugulose, below paraterga microgranular. Metaterga 2–19 with two transverse rows of setae: 2+2 in anterior (pre-sulcus) row and 3+3 in posterior (postsulcus) one, all mostly abraded, but still traceable as insertion points. Tergal setae simple, moderately long, about 1/4 metatergal length. Axial line traceable. Paraterga very well developed (Fig. 55A-G), all lying below dorsum (at about 1/4 body height), slightly upturned to subhorizontal, in lateral view moderately strongly enlarged on pore-bearing segments, thinner on poreless ones; shoulders always present, broadly rounded and narrowly bordered, fused to callus; anterior edge of paraterga 2 straight, following paraterga rounded, caudal corner of all paraterga rounded, extending invariably and increasingly beyond rear tergal margin. Calluses delimited by a sulcus both dorsally and ventrally, rather broad. Posterior edge of paraterga evidently concave, especially strongly so on segments 16–19. Ozopores evident, lateral, lying in an ovoid groove at about 1/4 in front of caudal corner. Transverse sulcus complete on metaterga 5–18, incomplete on segments 4 and 19, very narrow, shallow, not reaching bases of paraterga, very finely ribbed at bottom (Fig. 55A, C & F). Stricture between pro- and metazona narrow and shallow, faintly beaded at bottom down to base of paraterga (Fig. 55A-F). Pleurosternal carinae complete crests with a sharp caudal tooth on segments 2–4, a low and interrupted swelling supplied with a small tooth caudally on segments 5–7, retained only as small denticles on segments 8–14, thereafter missing (Fig. 55B, D & E). Epiproct (Fig. 55E-G) conical, flattened dorsoventrally, with two small apical papillae directed ventrocaudally, subtruncate at tip; pre-apical papillae small, lying close to tip. Hypoproct (Fig. 55G) nearly semi-circular, caudal tip very broadly rounded, setiferous knobs at caudal edge very small and well-separated.

Sterna sparsely setose, without modifications; cross-impressions shallow; a pair of strongly separated, anteroventrally directed, narrowly rounded, setose cones between ♂ coxae 4 (Fig. 55H & I). A paramedian pair of small tubercles in front of gonopod aperture. Legs long and slender, midbody ones ca 1.3–1.5 times as long as body height, prefemora without modifications, ♂ tarsal brushes present until on legs of segment 17.

Gonopods (Fig. 56) a little more complex. Coxa long and slender, with several strong setae distodorsally. Prefemur densely setose, about half the length of femorite + “postfemoral” part. Femorite slender, slightly curved and nearly not enlarged distad, with a small, but conspicuous ventral knob near base of lamina lateralis, with a “postfemoral” part demarcated by a distinct, oblique, lateral sulcus; solenophore with a tridentate tip, middle denticle shorter than terminal tooth, but longer than a small subterminal lobule; solenomere long, flagelliform, a short tip exposed.

Orthomorpha fluminoris Hoffman, 1977, ♂ holotype. A, B anterior part of body, dorsal and lateral views, respectively C, D segments 10 and 11, dorsal and lateral views, respectively E–G posterior part of body, lateral, dorsal and ventral views, respectively H, I sternal cones between coxae 4, subcaudal and sublateral views, respectively.

Orthomorpha fluminoris Hoffman, 1977, ♂ holotype. A–C right gonopod, lateral, mesal and subcaudal views, respectively. Scale bar: 0.2 mm.

Remarks.

The original description is fairly complete, also illustrated in due detail (Hoffman 1973). The above redescription, also based on the holotype, is only meant to bring it to our standard and to present additional illustrations.

HoffmanRL (1977) Diplopoda from Malayan caves, collected by M. Pierre Strinati.Revue suisse de Zoologie 84 (3): 699-719.GolovatchSI (1998) On several new or poorly-known Oriental Paradoxosomatidae (Diplopoda Polydesmida), VI. Arthropoda Selecta 6(3–4): 35–46. [for 1997]HoffmanRL (1973) Descriptions and allocation of new or poorly known genera and species of Paradoxosomatidae from south-eastern Asia (Diplopoda: Polydesmida).Journal of Natural History 7: 361-389. doi: 10.1080/00222937300770281