Oxidus Cook, 1911

Anh D. Nguyen, Zoltán Korsós, Kuem-Hee Jang & Ui-Wook Hwang, 2017, A revision and phylogenetic analysis of the millipede genus Oxidus Cook, 1911 (Polydesmida, Paradoxosomatidae), European Journal of Taxonomy 293, pp. 1-22 : 5-6

Genus Oxidus Cook, 1911

Oxidus Cook, 1911: 628 .

Kalorthomorpha Attems, 1914: 195 (proposed as subgenus of Orthomorpha Bollman, 1893 ; junior objective synonym of Oxidus , see Jeekel 1968: 71).

Oxidus – Brölemann 1916: 537.

Type species

Fontaria gracilis C.L. Koch, 1847 , by original designation.

Diagnosis

The genus can be distinguished from other genera in the tribe Sulciferini by the combination of characters: paraterga being well-developed; metaterga with one or two rows of setae; legs without tarsal brushes; 5th sternum without modifcations.

Gonopod relatively complicated; femorite weakly twisted, slightly or strongly enlarged distally, strongly grooved mesally, well demarcated laterally from postfemoral lamina l by a distinct sulcus; solenophore with two basal processes: long, highly elevated process h and short, spiniform/tuberculiform, subtransverse process z; solenophore twisted or strongly spiral, with mesal well-developed lobule, but without lateral lobules; solenomere Fagelliform, completely sheathed by solenophore.

Remarks

This genus is distributed in the northern part of the Oriental and the eastern part of the Palearctic regions. It is unlikely that the genus is of tropical origin because it is absent from the tropical regions in the Oriental ( Jeekel 1963a). Its center of origin is more likely to be Japan ( Jeekel 1968).

The genus Oxidus was placed in Sulciferini in view of the characters of the spiral solenophore completely sheathing the solenomere, the presence of a postfemoral demarcation and of postfemoral processes ( Jeekel 1968). Golovatch & Enghoff (1993) recommended that the genus should be placed relatively close to the genus Tylopus Jeekel, 1968 , rather than to other sulciferinine genera. The phylogeny of the genus Oxidus is discussed below.