Oppeliidae

Oppeliidae
Oxycerites sp.
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Superfamily:	†Haplocerataceae
Family:	†Oppeliidae
Subfamilies
see text

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Oppeliidae are compressed to oxyconic, sculptured Haplocerataceae, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haplocerataceae, with the longest durantion, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildocerataceae.

Subfamilies

Nine subfamilies are recognized, the first 8 of which are include in the earlier Treatise, Part L. They are the

Oppeliinae

Hecticoceratinae

Distchoceratinae

Teramelliceratinae

Phlycticeratinae

Streblitinae

Mazapilitinae

Aconeceratinae

Binneyitinae

The Binneyitinae was added by Donovan et al, 1981. transferred from the Stephanocerataceae.

References-

D.T Donavan, J.H. Callomon, and M.K Howarth. 1981. Classification of the Jurassic Ammonitina. In The Ammonoidea. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub Academic Press.

Treatise on Invertebrate Paleontology Part L Mollusca 4, Mesozoic Ammonoidea. R.C Moore (ed); Geol Society of America and Univ. Kansas Press. (1957)