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However, the ventral valve of Australostrophia mesembria, type species of the genus, is weakly convex, while the dorsal is very gently concave.
Consequently, the species is here proposed to be the type species of a new genus related to Girtyocoelia Cossmann, 1909.
These characters alone are insufficient to characterize Schistometopus; thus, the genus is considered nomen dubium and the term is restricted to the type specimen of the type species .
The adult dorsal median septum, seen in the new species, is absent in the type species and dorsal muscle fields are more clearly defined.
This large group (Clade B) is formed by most of the species of the genus (including the type species , B. rotundifolium), which typically have parallel-veined leaves.
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