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
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| 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]
References
edit- ^ Mutvei, Harry (2015-07-03). "Characterization of two new superorders Nautilosiphonata and Calciosiphonata and a new order Cyrtocerinida of the subclass Nautiloidea; siphuncular structure in the Ordovician nautiloid Bathmoceras (Cephalopoda)". GFF. 137 (3): 164–174. doi:10.1080/11035897.2015.1061592. ISSN 1103-5897. S2CID 41162554.164-174&rft.date=2015-07-03&rft_id=https://api.semanticscholar.org/CorpusID:41162554#id-name=S2CID&rft.issn=1103-5897&rft_id=info:doi/10.1080/11035897.2015.1061592&rft.aulast=Mutvei&rft.aufirst=Harry&rft_id=http://www.tandfonline.com/doi/full/10.1080/11035897.2015.1061592&rfr_id=info:sid/en.wikipedia.org:Cyrtocerinidae" class="Z3988">
- ^ a b c d Flower, Rousseau H. (1964). "The nautiloid order Ellesmeroceratida (Cephalopoda)" (PDF). New Mexico Bureau of Mines and Mineral Resources Memoir. 12: 1–164.1-164&rft.date=1964&rft.aulast=Flower&rft.aufirst=Rousseau H.&rft_id=https://geoinfo.nmt.edu/publications/monographs/memoirs/downloads/12/Memoir-12.pdf&rfr_id=info:sid/en.wikipedia.org:Cyrtocerinidae" class="Z3988">
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