Cyrtorizoceras Hyatt, 1900

Kröger, Björn, 2025, The Lyckholm acme of cephalopods - Review of the late Katian (Vormsi-Pirgu regional stages) Ordovician cephalopods of Estonia, European Journal of Taxonomy 978, pp. 1-169 : 84

publication ID	https://doi.org/10.5852/ejt.2025.978.2801
publication LSID	lsid:zoobank.org:pub:422E6F06-B4C8-4840-854C-811145D88B32
DOI	https://doi.org/10.5281/zenodo.14988533
persistent identifier	https://treatment.plazi.org/id/93268783-9625-7075-FDA0-FCDCFD96FB03
treatment provided by	Plazi
scientific name	Cyrtorizoceras Hyatt, 1900
status

Treatment

Genus Cyrtorizoceras Hyatt, 1900 View in CoL

Type species

Cyrtoceras minneapolis Clarke, 1897 , from Minneapolis, Minnesota, USA, Platteville Formation, Black River Group, Sandbian; by original designation.

Diagnosis

Compressed cyrtocones; dorsal and ventral profiles diverging constantly adorally; sides converging slightly over mature body chamber; aperture with deep hyponomic sinus; nearly smooth or ornamented with transverse costae; siphuncle subventral, slender; segments slightly expanded, probably empty. (Adopted from Sweet 1964b.)

References

Copyright notice

No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.

Taxonomy

Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
SubClass	Multiceratoidea
Order	Oncoceratida
Family	Oncoceratidae

Specimens

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