What is "form genus"

n. (context taxonomy English) A collection of organisms that is given formal recognition at the rank of genus with a taxonomic name, but which is known to be an artificial group rather than a natural one.

1. n. (biology) an artificial taxonomic category for organisms of which the true relationships are obscure

2. an artificial taxonomic category established on the basis of morphological resemblance for organisms of obscure true relationships especially fossil forms