|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Chondrichthyes - Sphenacanthidae
It was assigned to Cestraciontidae by Woodward (1889); to Heterodontidae by Jordan (1963); to Ctenacanthida by Sepkoski (2002); and to Sphenacanthidae by Ivanov (1999), Pauliv et al. (2012), Ivanov et al. (2013) and Ivanov (2017).
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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.