|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 Lamninae by Hay (1902); to Lamnidae by Jordan (1963); to Hexanchiformes by Sepkoski (2002); and to Orthacodontidae by Duffin and Ward (1993), Rees (2000) and Stumpf and Kriwet (2019).
|Year||Name and author|
|1843||Lamna (Sphenodus) Agassiz p. 288|
|1843||Sphenodus Agassiz p. 288|
|1889||Orthacodus Woodward p. 349|
|1902||Sphenodus Hay p. 302|
|1963||Orthacodus Jordan p. 599|
|1963||Sphenodus Jordan p. 599|
|1993||Sphenodus Duffin and Ward p. 56|
|2000||Sphenodus Rees p. 415|
|2002||Sphenodus Sepkoski, Jr.|
|2019||Sphenodus Stumpf and Kriwet p. 644|
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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.