|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Chondrichthyes - Eugeneodontiformes - Agassizodontidae
It was assigned to Edestidae by Larson and Scott (1955), Jordan (1963) and Kelly and Zangerl (1976); to Helicoprionidae by Hanger and Strong (1998); to Eugeneodontida by Sepkoski (2002); and to Agassizodontidae by Zangerl (1981) and Ginter et al. (2010).
|Year||Name and author|
|1899||Helicoprion Karpinsky p. 25|
|1955||Helicoprion Larson and Scott p. 918|
|1963||Helicoprion Jordan p. 596|
|1963||Lissoprion Jordan p. 596|
|1976||Helicoprion Kelly and Zangerl|
|1981||Helicoprion Zangerl p. 86|
|1998||Helicoprion Hanger and Strong p. 531|
|2002||Helicoprion Sepkoski, Jr.|
|2010||Helicoprion Ginter et al. p. 126|
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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.