What is "barremitinae"

Barremitinae is a subfamily belonging to the Ammonoidea subclass. Whorl section in this group ranges from more or less circular through rectangular to oxyconic. Ribbing, if present, is weak. Suture is relatively simple, without markedly retracted suspensive lobe.

This animal lived during the Lower Cretaceous, from Upper Valanginian to Upper Barremian.