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Rizoceras

Cephalopoda - Oncocerida - Oncoceratidae

Taxonomy
Rizoceras was named by Hyatt (1884). It is the type genus of Rizoceratidae.

It was assigned to Rizoceratidae by Hyatt (1900); to Maelonoceratidae by Miagkova (1967); to Oncoceratidae by Teichert et al. (1964) and Crick (1981); and to Oncoceratida by Sepkoski (2002).

Synonymy list
YearName and author
1884Rizoceras Hyatt p. 276
1900Rizoceras Hyatt p. 529
1964Rizoceras Teichert et al. p. 288
1967Rizoceras Miagkova
1981Rizoceras Crick p. 229
2002Rizoceras Sepkoski

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
subclassMulticeratoidea()
orderOncocerida()
familyOncoceratidaeHyatt 1884
genusRizocerasHyatt 1884

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Rizoceras Hyatt 1884
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Rizoceras acris Miagkova 1967
Rizoceras inventum Miagkova 1967
Rizoceras rectum Miagkova 1967
Diagnosis
ReferenceDiagnosis
A. Hyatt 1900Orthoceracones and cyrtoceracones expanding regularly by growth throughout life, the living chamber very slightly or not sensibly contracted in gerontic stage. Aperture constantly open, and with slight dorsal as well as somewhat deeper and
broader hyponomic sinuses. Siphuncle generally small and empty, but actiniform lamellae and an endosiphuncle sometimes occur. Shells as a rule smooth or with transverse bands only, but longitudinal striae often present in earlier stages