Cyrtocerinidae
| Cyrtocerinidae Temporal range: Ordovician
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| Scientific classification | |
| Kingdom: | |
| Phylum: | Mollusca
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| Class: | |
| Subclass: | Nautiloidea
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| Order: | |
| Family: | Cyrtocerinidae Flower, 1946
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Cyrtocerinidae is a family of ellemerocerids with slightly endogastric (inwardly curved) breviconic shells with ventral siphuncles that have connecting rings thickened as lobes that project straight into the interior.[citation needed]
Cyrtocerinidae was established by Flower, 1946, (Flower 1964) for the genus Billings 1865, found at various locations across North America. The shells are generally small, laterally compressed, and dorsum more narrowly rounded than the venter.[citation needed]
References[]
- Rousseau H Flower, 1964. Memoir 12. The Nautiloid Order Ellesmericerida (Cephalopoda). State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, New Mexico.
- Cyrtocerinidae in PaleoDB [1]
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Categories:
- Prehistoric nautiloid families
- Ordovician first appearances
- Ordovician extinctions
- Ellesmerocerida
- Prehistoric nautiloid stubs