|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Cephalopoda - Ammonitida - Sphenodiscidae
It was assigned to Ammonoidea by Sepkoski (2002); and to Sphenodiscidae by Zaborski (1985), Kennedy (1986), Kennedy and Cobban (1996), Kennedy et al. (1996), Kennedy et al. (1997) and Landman and Cobban (2003).
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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.