Class Cephalopoda | ||
Epicephalites is a perisphictid ammonite, included in the subfamily Aulacostephaninae, from the Upper Jurassic of New Zealand and Mexico, related to Involuticeras. Its shell is involute, whorls inflated with a deep umbilicus. The outer half including the venter is ribbed, the inner half is smooth.
References
Epicephalites Wikipedia(Text) CC BY-SA