Classification of Frey 1981

Subcl. Nautiloidea Agassiz 1847 [nautiloid]
show all
Or. †Orthocerida Kuhn 1940
hide
Fm. †Narthecoceratidae Flower 1958
hide
G. †Narthecoceras Hyatt 1895
hide
Narthecoceras dunni Frey 1981