Epicephalites
Encyclopedia
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.
Ammonitina
The Ammonitina comprises a diverse suborder of ammonoid cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods.The shells of...
, included in the subfamily Aulacostephaninae, from the Upper Jurassic of New Zealand and Mexico, related to Involuticeras
Involuticeras
Involuticeras: a perisphinctacean ammonite belonging to the Aulacostephanininae from the Upper Jurassic of Europe and possibly Mexico. Shell involute, moderately compressed,venter rounded, ribbed. Similar in general form to Aulacostephanus and Epicephalites----Treatise on Invertebrate Paleontology,...
. Its shell is involute, whorls inflated with a deep umbilicus. The outer half including the venter is ribbed, the inner half is smooth.