|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Chondrichthyes - Synechodontiformes - Orthacodontidae
It was reranked as Lamna (Sphenodus) by Agassiz (1843).
It was assigned to Lamna by Agassiz (1843); to Lamnidae by Jordan (1963); to Orthacodontidae by Duffin and Ward (1993) and Rees (2000); and to Hexanchiformes by Sepkoski (2002).
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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.