Goniatitoidea, formerly Goniatitaceae in older publications, is a superfamily of late Paleozoic

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

cephalopods included in the

Goniatitida Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniat ...

. They are characterized by thinly discoidal to globular shells with variable umbilici and sculpture. The ventral lobe, located along the outer margin, is prominently bifurcated (two pronged); the lateral lobe undivided.

References

* Miller, Furnish, and Schindewolf 1957. Paleozoic Ammonoidea; ''Treatise on Invertebrate Paleontology'', Part L Ammonoidea; Geologocial Society of America and Univ. of Kansas Press.
Goniatitoidea
http://paleodb.org/cgi-bin/bridge.pl Paleo db] 9/07/2013 *Goniatitoidea in GONIAT Taxonomy onlin

Goniatitoidea, Goniatitida superfamilies Goniatitina {{Goniatitida-stub