[1] The genus of Eryniopsis was initially created in 1984, based on Eryniopsis lampyridarum, for species with primary conidia that are multi-nucleate (ca 4–12 nu-clei), unitunicate (having one wall in the ascus) and elongate (rather than globose (rounded) or pyriform (pear-shaped)).

In 1993, two more species that produce elongate secondary conidia were added to Eryniopsis (Keller & Eilenberg 1993).

Eryniopsis transitans was known only from Limoniidae (formerly a subfamily of crane flies, Tipulidae) found in Switzerland and also Eryniopsis ptychopterae which was known only from Ptychopteridae (phantom crane flies, closely related to Tipulidae) and found in Denmark.

[8][9][10] Species Eryniopsis caroliniana has been found on (Diptera order) 'Tipulidae hosts in North America, central and western Europe.

[4] Species Eryniopsis longispora has been found on (Diptera order) small Nematocera hosts in Poland.