Malayorthomorpha Mrsic , 1996

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Sittichaya, Wisut, 2022, Review of the millipede genus Malayorthomorpha Mrsic, 1996 (Diplopoda, Polydesmida, Paradoxosomatidae), with descriptions of two new species from Thailand and a key to its species, ZooKeys 1118, pp. 1-19 : 1

Genus Malayorthomorpha Mrsic, 1996

Malayorthomorpha Mršić, 1996: 139 (D).

Malayorthomorpha - Golovatch 1997: 134 (M, K); Shelley et al. 2000: 111 (L).

Amended diagnosis.

Body medium-sized to large (ca. 24-41 mm long, ca. 1.2-2.7 mm wide), with 20 segments. Paraterga from poorly to rather well developed, without lateral incisions. Transverse metatergal sulcus distinct. Leg relatively long and slender, without modifications. ♂ tarsal brushes absent. Sternal lobe between ♂ coxae 4 present, other sternites unmodified.

Gonopods rather simple to relatively complex; coxites elongate, subcylindrical, sparsely setose distoventrally, without tubercles; prefemoral (= setose) part of telopodite moderate to relatively large, 1/3-1/2 as long as acropodite; femorite moderately long and stout, slightly curved, devoid of a distinct distolateral sulcus demarcating a postfemoral part; a well-developed lamina medialis and a hypertrophied lamina lateralis of solenophore; the latter subterminally with a long, distally pointed and curved lobe broadened at base and protecting the tip of a curved solenomere. Apex of solenophore subquadrate. Solenomere flagelliform, starting about level to demarcation cingulum between femorite and solenophore, seminal groove running entirely or mostly mesally along an excavate femorite.

Type species.

Malayorthomorpha siveci Mršić, 1996, by original designation.

Affinities.

As noted earlier ( Golovatch 1997, 1998), the gonopodal conformation of Malayorthomorpha seems to especially similar to that of Cleptomorpha Golovatch, 1997, a monospecific genus of Orthomorphini from Sumatra, Indonesia. Yet both genera compared differ clearly in the gonopod femorite showing an indistinct, oblique, mesal fold, a relatively slender solenophore and an apically terminating solenomere in Cleptomorpha compared to the gonopod femorite that is clearly excavated mesally, has a considerably stouter solenophore, and the solenomere termnating mesally about the solenophore midway in Malayorthomorpha ( Golovatch 1997).