Alienostreptus Pimvichai, EnghOff & Panha, 2010

Pimvichai, Piyatida, Akkari, Nesrine, Semenyuk, Irina, Constant, Jerôme & Enghoff, Henrik, 2020, A strikingly coloured new giant millipede from Vietnam has copycat in Borneo (Diplopoda, Spirostreptida, Harpagophoridae), European Journal of Taxonomy 722, pp. 1-15 : 3-4

Genus Alienostreptus Pimvichai, EnghOff & Panha, 2010

Alienostreptus Pimvichai et al., 2010: 58 .

Type species

Thyropygus alienus Attems, 1936 , by original designation. This until now monotypic genus was erected by Pimvichai et al. (2010) who agreed with Jeekel (2006) that Thyropygus alienus is not congeneric with Thyropygus mundus Attems, 1936 , type species of Cercostreptus Demange, 1961, a genus originally, but invalidly, created as a new subgenus of Anurostreptus Attems, 1914 by Attems (1942).

In the morphology-based phylogeny of Rhynchoproctinae by Pimvichai et al. (2010), Alienostreptus comes out in the middle of a paraphyletic sequence of one-genus branches, between Balustreptus HOffman, 1980 , and Winklerostreptus Demange, 1969 . Phenetically, Alienostreptus is most similar to Balustreptus , sharing a series of transverse ridges across the apical part of the telopodite, presence of more than one spine on gonopod telopodites, presence of tarsal pads covering the entire ventral surface Only On tibia Of walking legs, and an UnmOdified cOllUm. FrOm Balustreptus , Alienostreptus differs, i.e., by having twO ‘femOral’ spines On the gOnOpOds as well as having the apical part Of the telOpOdite broadly expanded.

Pimvichai et al. (2010) diagnosed the genus Alienostroptus based on one species, viz, Alienostreptus alienus ( Attems, 1936) . Here, we revise the genus diagnosis to accommodate the new species (characters changed from Pimvichai et al. 2010 in bold):

A genus of Rhynchoproctinae . Collum narrowed laterally, ends rounded–truncate, with strong anterolateral marginal groove and ridge; stipes of mandibles with a ventral abruptly narrowed swollen lObe; cOxae Of the seventh pair Of legs UnmOdified; ventral sOft pads Only On tibiae On all legs except first two pairs; epiproct with a projection; hypoproct completely fused with epiproct. Gonopod sternum (st) absent; flap (fl) tongue-shaped, thin, projecting caudad from mesal margin of coxa; femoral spine long, duplicated (fe); apical part of telopodite broadly expanded, with several strong transverse ridges (tr) across outer surface, apically with a row of pale spines (sp).