nounBotany & Zoology
The species on which a genus is based and with which the genus name remains associated during any taxonomic revision.
- 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.
- However, the ventral valve of Australostrophia mesembria, type species of the genus, is weakly convex, while the dorsal is very gently concave.
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