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Protokionoceras

Cephalopoda - Dissidocerida - Geisonoceratidae

Taxonomy
Protokionoceras was named by Grabau and Shimer (1910).

It was assigned to Michelinoceratidae by Sweet (1958); to Geisonoceratidae by Teichert et al. (1964) and Crick (1981); and to Orthocerida by Sepkoski (2002).

Synonymy list
YearName and author
1910Protokionoceras Grabau and Shimer
1958Protokionoceras Sweet
1964Protokionoceras Teichert et al. p. 237
1981Protokionoceras Crick p. 228
2002Protokionoceras Sepkoski

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
subclassOrthoceratoidea(M'Coy 1844)
orderDissidoceridaZhuravleva 1964
familyGeisonoceratidaeZhuravleva 1959
genusProtokionocerasGrabau and Shimer 1910

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. †Protokionoceras Grabau and Shimer 1910
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Protokionoceras fessicancellatum Kobayashi et al. 1984
Protokionoceras strandi Troedsson 1932
Diagnosis
No diagnoses are available