Acanthoscaphites

Acanthoscaphites is an extinct genus of cephalopod belonging to the Ammonite subclass. The average diameter of its shell was approximately, but some specimens have been found with a diameter of slightly over.

Classification

Acanthoscaphites was first described by Schluter in 1872. Subsequent taxonomic revisions indicate that the relationship between Acanthoscaphites and Trachyscaphites is still unclear: Acanthoscaphites may have evolved in parallel with or as a derivative of Trachyscaphites.
Species

A. plenus
A. tridens
''A. verneuilianus''

Biogeography

Acanthoscaphites was a widespread genus during Campanian and Maastrichtian times, approximately 80 million years ago. Its remains can be found in rocks of that age from Europe and North America.