Orthomorpha butteli Carl, 1922

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 : 101-104

Orthomorpha butteli Carl, 1922 Figs 112113

Orthomorpha butteli Carl 1922: 576 (D).

Orthomorpha consocius Chamberlin 1945: 11 (D), syn. n.

Pratinus butteli - Attems 1937: 121 (D).

Orthomorpha butteli - Jeekel 1963: 266 (M); 1964: 362 (M, D); 1968: 45 (M); Golovatch 1998: 42 (M).

Orthomorpha consocius - Jeekel 1963: 265 (M); 1964: 359 (M); 1968: 45 (M); Golovatch 1998: 42 (D).

Holotype.

♂ of Orthomorpha consocius (AMNH), Indonesia, Java Barat, Tjibodas, 07.1920, leg. Dammerman.

Redescription.

Length 25.5 mm, width of midbody pro- and metazona 2.2 and 3.2 mm, respectively.

Coloration of alcohol material after long-term preservation yellowish-brown with contrasting pallid paraterga; venter, legs and antennae light yellowish (Fig. 112A-G).

Clypeolabral region densely setose, vertex sparsely so, epicranial suture distinct. Antennae moderately long, clavate (antennomere 6 broadest), extending behind body segment 3 dorsally (Fig. 112B). Head in width <collum <segment 3 = 4 <2 <5-16; thereafter body gently and gradually tapering. Collum semi-lunar, with three transverse rows of setae; 4+4 anterior, 1+1 intermediate and 3+3 posterior; caudal corner of paraterga subrectangular, very narrowly rounded, slightly declined ventrad, not surpassing rear tergal margin (Fig. 112A & B). Tegument dull, prozona very finely shagreened, metazona leathery, evidently rugulose, below paraterga microgranular and faintly rugulose. Postcollum metaterga with an anterior transverse row of 2+2 and a posterior of 3+3 insertion points. Axial line not traceable. Paraterga very well-developed (Fig. 112A-G), all lying below dorsum, set at about 1/3 body height, subhorizontal, in lateral view modestly enlarged on pore-bearing segments, thinner on poreless ones; shoulders always present, regularly rounded and narrowly bordered, fused to callus; caudal tips of all paraterga pointed, beak-like, extending increasingly beyond rear tergal margin, best developed and slightly curved mesad on segments 15-19. Calluses developed only dorsally. Paraterga 2 broad, front margin angulate and rounded, lateral margin with three small, but evident denticles, but only with two small incisions on following segments. Posterior edge of paraterga evidently concave, especially strongly so on segments 15-19. Ozopores evident, lateral, lying in an ovoid groove at about 1/3-1/4 in front of caudal corner. Transverse sulcus present on metaterga 5-18, broad, shallow, not reaching bases of paraterga (Fig. 112A, C & F). Stricture between pro- and metazona narrow and rather shallow, evidently beaded at bottom down to base of paraterga (Fig. 112A-F). Pleurosternal carinae like complete crests with a sharp caudal tooth on segments 2 and 3, as a low swelling on segment 4, thereafter missing (Fig. 112B & D). Epiproct (Fig. 112E-G) conical, flattened dorsoventrally, with two evident apical papillae directed ventrocaudally, slightly emarginate at tip; pre-apical papillae very evident, lying close to tip. Hypoproct (Fig. 112G) roundly subtriangular, setiferous knobs at caudal edge well-separated and small.

Sterna sparsely setose, without modifications; cross-impressions shallow; with an evident, paramedian, sparsely setose, directed anteroventrally, bulge between ♂ coxae 4, this bulge showing traces of axial division (Fig. 112H & I). Legs long and slender, midbody ones ca 1.3-1.4 times as long as body height, prefemora without modifications, ♂ tarsal brushes present only on legs 1-8.

Gonopods (Fig. 113) simple. Coxa long and slender, with several strong setae distodorsally. Prefemur rather long, densely setose, about as long as femorite (+ “postfemoral” part). Femorite strongly enlarged, club-shaped, slightly curved, with only very faint traces of an oblique lateral impression. Solenophore with a somewhat folded base of lamina medialis; tip poorly bilobule, terminal lobule blunt, a little larger than inner one, each being supplied with a minute indentation near base; solenomere long, and flagelliform.

Remarks.

The original description of Orthomorpha consocius Chamberlin, 1945 being anecdotal ( Chamberlin 1945), above is its redescription, based on the holotype coming from Tjibodas, Java, Indonesia. A comparison of the redescription with the original description of Orthomorpha butteli Carl, 1922, also from Tjibodas, leaves no doubt about their synonymy, because they coincide in virtually every detail, including gonopod structure. Hence the new synonymy advanced.

Concerning the status of Orthomorpha butteli Carl, 1922, because of its strikingly shortened gonopod femorite (Fig. 113), Golovatch (1998) preferred to exclude this species from Orthomorpha , even though ( Jeekel (1963, 1968) had regarded it as a congener, albeit fairly disjunct. Now we are inclined to follow Jeekel, chiefly because all of the other characters in Orthomorpha butteli , including the very broad paraterga, are those of a typical Orthomorpha . So this time we include it into our key below.

Dubious species