Cladus: Eukaryota Name Risdonius Hickman, 1939 Type species: Risdonius parvus Hickman, 1939, by monotypy References * Hickman, V. V. 1939. On a dipneumone spider (Risdonius parvus, gen. et sp. n.), the female of which has reduced palpi. Proceedings of the Zoological Society of London (B) 108: 655-660. [655]
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