Orthomorpha zehntneri Carl, 1902

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 : 62-65

Orthomorpha zehntneri Carl, 1902 Figs 5354

Orthomorpha Zehntneri Carl 1902: 584 (D).

Orthomorpha Zehntneri - Attems 1907: 83 (M); 1914: 192 (M, D).

Orthomorpha zehntneri - Attems 1930a: 127 (D); 1937: 73 (D); Jeekel 1963: 265 (M); 1964: 361 (M, D); 1968: 45 (M); 1980b: 325 (D); Golovatch 1998: 42 (D, M).

Syntypes.

2 ♂, 1 ♀ (MHNG), Indonesia, Java, no date, leg. L. Zehntner.

Redescription.

Length 19-22 (♂) or 24 mm (♀), width of midbody pro- and metazona 1.4-1.5 and 2.1-2.4 mm (♂), 2.0 and 2.6 mm (♀), respectively (vs 2.8 mm in width, as given in the original description ( Carl 1902)). Coloration of alcohol material after long-term preservation dark castaneous brown with contrastingly light red-brown to pallid paraterga, venter, and basal podomeres; antenomere 7 blackish, tip of antennae pallid (Fig. 53).

Clypeolabral region densely setose, vertex sparsely so, epicranial suture distinct. Antennae moderately long, clavate (antennomere 6 broadest), extending behind body segment 3 (♂) or 2 (♀) dorsally (Fig. 53A & B). Head in width <collum <segment 2 <3 and 4 <5-16; thereafter body gently and gradually tapering. Collum semi-lunar, with three transverse rows of setae, 4+4 anterior, 2+2 intermediate and 3+3 post erior; caudal corner of paraterga pointed, slightly declined ventrally and continuing collum’s convexity (Fig. 53B); paraterga subrectangular, slightly surpassing rear tergal margin (Fig. 53A & J). Tegument smooth and shining, prozona very finely shagreened, metaterga leathery, faintly rugulose, below paraterga microgranular, faintly rugulose. Metaterga 2-19 with an anterior transverse row of 2+2, mostly abraded setae; caudal row barely traceable as 3+3 insertion points. Tergal setae simple, rather long, about 1/3 metatergal length. Axial line faint, starting from collum. Paraterga very well developed (Fig. 53A-G & J-L), especially well so in ♂, all lying below dorsum (at about 1/4 midbody height), subhorizontal, in lateral view modestly enlarged on pore-bearing segments, thinner on poreless ones; shoulders always present, mostly regularly rounded and narrowly bordered, fused to callus; caudal corner of all paraterga pointed, beak-like, extending increasingly beyond rear tergal margin, best developed and slightly curved mesad on segments 15-19. Calluses delimited by a sulcus both dorsally and ventrally, with three small, but evident lateral denticles on callus 2, with one or two similar, often setigerous incisions in front of following poreless segments, and with one incision on pore-bearing ones. 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 5-17, incomplete on segments 4 and 18, narrow, shallow, reaching bases of paraterga, finely beaded at bottom, better developed in ♂ (Fig. 53A, C, F & J-L). Stricture between pro- and metazona narrow and rather shallow, evidently beaded at bottom down to base of paraterga (Fig. 53A-G & J-L). Pleurosternal carinae complete crests with a sharp caudal tooth on segments 2 and 3, thereafter like increasingly poorly developed, flat ridges with small caudal teeth until segment 8, further on caudally only like an increasingly small, sharp, caudal tooth until segment 16 (♂, ♀) (Fig. 53B, D & E). Epiproct (Fig. 53E-G & L) conical, inflated dorsoventrally, with two evident apical papillae directed ventrocaudally, subtruncate at tip; pre-apical papillae evident, lying close to tip. Hypoproct (Fig. 53G) subtrapeziform, slightly rounded at caudal margin, setiferous knobs at caudal edge large and well-separated.

Sterna sparsely setose, without modifications; cross-impressions shallow; with a paramedian pair of very evident, anteroventrally directed lobe deeply, but incompletely split into two between ♂ coxae 4 (Fig. 53H & I). A paramedian pair of small tubercles in front of gonopod aperture. Legs long and slender, midbody ones ca 1.3-1.5 (♂) or 0.9-1.1 times (♀) as long as body height, prefemora without modifications, ♂ tarsal brushes present until legs of segment 16.

Gonopods (Fig. 54) simple. Coxa long and slender, with numerous strong setae distodorsally. Prefemur densely setose, almost 3 times shorter than femorite + “postfemoral” part. Femorite slender, slightly curved and rather evidently enlarged distally, with a “postfemoral” part demarcated by an oblique lateral sulcus; solenophore with lamina lateralis much smaller than lamina medialis, the former slightly helicoid, forming a tridentate and mesally curved tip; both terminal and subterminal denticles/spikes subequal, acute and narrow, middle denticle nearly as long or shorter; solenomere long and flagelliform.

Remarks.

The above redescription is meant to augment the fairly complete one by Jeekel (1980b) which was also based on syntypes.