Protokionoceras Grabau et Shimer, 1910
Aiheeseen liittyvät julkaisut
Sweet, W. C. 1958. The Middle Ordovician of the Oslo Region, Norway: 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38, 1, 1-178.
List of species
1. Protokionoceras isotelorum Strand, 1934 | Ordovician
2. Protokionoceras strandi Troedsson, 1932 | Upper Ordovician
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Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Orthoceratia |
| Order | Orthocerida |
| Suborder | Orthoceratina |
| Family | Geisonoceratidae |
| Genus | Archigeisonoceras |
| Geisonoceras | |
| Harrisoceras | |
| Ioachimoceras | |
| Kinnekulloceras | |
| Nilssonoceras | |
| Ordogeisonoceras | |
| Temperoceras | |
| unranked | Protokionoceras |
| Species | isotelorum |
| strandi |
See also