Pleuroacanthitidae is a small family of Lower Jurassic

ammonoids 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 cuttle ...

that combines some characters of the

Lytoceratina Lytoceratina is a Suborder (biology), suborder of Jurassic and Cretaceous Ammonitida, ammonites that produced loosely coiled, evolute and gyroconic shells in which the sutural element are said to have complex moss-like endings. Morphologic chara ...

Phylloceratina The Phyllocertina comprise a suborder of ammonoid cephalopods, belonging to the Ammonitida, whose range extends from the Lower Triassic to the Upper Cretaceous. Shells of the Phylloceratina are generally smooth with small to large umbilici and ...

, and earliest

Ammonitida Ammonitida is an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, a ...

, as well as special characters of its own. It is subdivided (Arkell ''et al.'', 1957) into two subfamilies, each represented by a single genus, the Pleuroacanthitinae containing '' Pleuroacanthites'' and the Analytoceratinae containing ''

Analytoceras ''Analytoceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass that lived during the early Jurassic. ''Analytoceras'', named by Alpheus Hyatt in 1900, is a Lytoceratida, lytoceratid and only member of the Pleuroacanthitidae, ...

''.

References

* W.J Arkell ''et al'' 1957. Mesozoic Ammonoidea,

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

, Part L Ammonoidea, p. L192-193 Ammonitida families Lytoceratina Early Jurassic first appearances Early Jurassic extinctions {{Ammonitida-stub