- form genus - (biology) an artificial taxonomic category for organisms of which the true relationships are obscure
--1 is a kind of genus
- form genus - an artificial taxonomic category established on the basis of morphological resemblance for organisms of obscure true relationships especially fossil forms
--2 is a kind of genus
- form genus - an artificial taxonomic category established on the basis of morphological resemblance for organisms of obscure true relationships especially fossil forms