Oppeliidae
| Oppeliidae | |
|---|---|
 |
|
| Oxycerites sp. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Superfamily: | †Haplocerataceae |
| Family: | †Oppeliidae |
| Subfamilies | |
|
see text |
|
see text
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.
Nine subfamilies are recognized, the first eight of which are included in the earlier Treatise, Part L. They are the:
The Binneyitinae was added by Donovan et al, 1981, transferred from the Stephanocerataceae.
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