|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Tergomya - Cyrtonellida - Cyrtolitidae
It was assigned to Bellerophontacea by Knight et al. (1960); to Sinuitopsida by Starobogatov (1970); to Helcionellacea by Runnegar and Jell (1976); to Cyrtonellacea by Horný (1992) and Wahlman (1992); to Gastropoda by Frýda (1999); and to Cyrtonellida by Ebbestad and Yochelson (2000).
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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.