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 : 15

Key to species of the genus Oxidus Cook, 1911

1. Gonopod femorite stout, more or less cylindrical. Spine z small and short, blunt spiniform ............................................................................................. O. obtusus ( Takakuwa, 1942)

– Gonopod femorite strongly expanded distad, not cylindrical. Spine z long, pointed tuberculiform or spiniform .......................................................................................................................................... 2

2. Postfemoral lamina l small, spiniform. Spine z stout, tip more or less rounded, tuberculiform. Base of solenophore slender; mesal lobule clearly separated from rounded tip of solenophore ................................................................................................. O. avia ( Verhoeff, 1937)

– Postfemoral lamina l large, not spiniform. Spine z pointed spiniform. Base of solenophore not slender; tip of solenophore emarginated .......................................................................................... 3

3. Postfemoral lamina l triangular. Mesal lobule not separated from solenophore tip ……………… ………………………………………………………………………… O. riukiaria ( Verhoeff, 1940)

– Postfemoral lamina l not triangular. Mesal lobule clearly separated from solenophore tip ………4

4. Postfemoral lamina l sub-pentagonal. Process h and spine z not separated clearly at base of postfemoral region. Process h pointed …………………………………… O. gigas ( Attems, 1953)

– Postfemoral region l rectangular. Process h and spine z clearly separated at base of postfemoral region. Process h serrated along upper edge ……………………………… O. gracilis ( C.L. Koch, 1847)