Binneyitidae

Binneyitidae is a family of Upper Cretaceous ammonoid cephalopods characterized by rather small, compressed, flat sided shells and sutures that tend to have deep, narrow, simple elements with parallel sides, that range from the upper Cenomanian into the lower Santonian.^[1]

Binneyitidae Temporal range: Late Cenomanian to early Santonian
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Haploceratoidea
Family:	Binneyitidae Reeside, 1927
Genera
see text

Three genera are included, as follows.

Borrisjakoceras Arkangelski 1916 - Shells moderately evolute to rather involute, venter bluntly trapezoidal to rounded. Stratigraphic range: U Cenomanian - L Turonian. Found in Kansas, Montana, and Turkmenistan.

Binneyites Reeside, 1917 - Shells very involute, venter flat. Ventrolateral ornament stronger than on Borrisjakoceras. First found in the Coniacean of Wyoming. Range known from middle Turronian to the lower Santonian.

Johnsonites Cobban 1961 - Type and only known species is Johsonites sulcatus.

Binneyitidae, according to C.W. Wright et al., 1996, is now regarded as belonging to the Haploceratoidea. Originally the Binneyitidae was included in the Acanthoceratoidea based on the possibility of descent from a compressed acanthoceratid such as Protacanthoceras.

References

1. Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.

• W.A. Cobban, The ammonite family Binneyitidae Reeside in the Western Interior of the United States, Abstract
• C.W. Wright et al., 1996. Treatise on Invertebrate Paleontology (Revised ) L(4). Fossilworks Binneyitidae