Cyrtocerinidae
Extinct family of molluscs
From Wikipedia, the free encyclopedia
Cyrtocerinidae is a family of nautiloid cephalopods in the Order Cyrtocerinida,[1] previously considered ellesmerocerids.[2] Members of the family have slightly endogastric (inwardly curved) breviconic shells with ventral siphuncles that have connecting rings thickened as lobes that project straight into the interior.[2]
| Cyrtocerinidae Temporal range: Ordovician | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Cyrtocerinida |
| Family: | †Cyrtocerinidae Flower, 1946 |
| Genera | |
| |
Cyrtocerinidae was established by Flower 1964[2] for the genus Cyrtocerina Billings 1865, found at various locations across North America. The shells are generally small, laterally compressed, and dorsum more narrowly rounded than the venter.[2]
