The Tropitidae is a family of Upper Triassic Ammonoidea belonging to the

Tropitoidea Tropitoidea, formerly Tropitaceae, is an extinct superfamily of ammonite cephalopods in the order Ceratitida Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Uppe ...

, a superfamily of the

Ceratitida Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from t ...

Tropitidae have subspherical to discoidal, involute to evolute shells with long body chambers and a ventral keel bordered by furrows. The surface may have ribs, nodes, or spines, or may be smooth. The suture is generally ammonitic, but may be ceratitic to goniatitic. The derivation of the Tropitidae is uncertain but they seem to form a group along with the Tropiceltitidae and

Haloritidae The Haloritidae is a family of subglobular, involute, Triassic ammonoids belonging to the ceratitid superfamily Tropitoidea. Their shells may be smooth or may have ribs that cross or are interrupted on the venter, and may have nodes. Keels and ven ...

within the superfamily.

Genera

Tropididae genera included: fossilworks.org - Tropitidae page
/ref> *'' Acanthotropites'' *''

Anatropites ''Anatropites'' is a genus of ammonite in the ceratitid family Tropitidae with spines instead of nodes on the umbilical shoulder, at least in early whorls.Arkell et al. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoide ...

'' *'' Arctotropites'' *''

Arietoceltites ''Arietoceltites'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *'' Discotropites'' *'' Euisculites'' *'' Gymnotropites'' *''

Homerites ''Homerites'' is a genus of small, involute, globase fossil Ceratitida, ceratitids with an eccentric outer whorl and subammonitic sutures belonging to the family Halortidae The body chamber has a slight central keel and radial dichotomous branch ...

'' *'' Homeroceras'' *'' Hoplotropites'' *'' Indonesites'' *'' Jovites'' *'' Margaritropites'' *'' Microtropites'' *'' Paratropites'' *'' Paulotropites'' *'' Platotropites'' *'' Pleurotropites'' *'' Sibyllites'' *'' Tritropidoceras'' *'' Tropites''

References

* Arkell et al. 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, 1957 * Bernhard Kummel, 1952. A Classification of Triassic Ammonoids. Jour of Paleontology Vol. 26, No. 5, pp 847–853, Sept. 1952 Tropitaceae Ceratitida families Late Triassic first appearances Late Triassic extinctions {{Ceratitida-stub