About: Neocardioceras

Neocardioceras is a genus of evolute acanthoceratid ammonites from the uppermost Cenomanian, Upper Cretaceous, of Europe, western U.S. and Brazil. As described in Cobban, Hook & Kenneday, 1989, Neocardioceras is a fairly small, moderately evolute, generally compressed ammonite that has prominent and very numerous rectoradiate to prorsiradate ribs and umbilical, inner and outer, and siphonal (mid ventral) tubercles. Primary ribs begin in the umbilicus or rise from umbilical tubercles and secondary ribs arise further out on the flank. The ribs bend forward at the position of the inner ventrolateral tubercles and cross the venter as chevrons, where they support the outer ventrolateral and siphonal tubercles.