|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Tergomya - Cyrtonellida - Cyrtonellidae
It was assigned to Bellerophontacea by Knight et al. (1960); to Bellerophontida by Sepkoski (2002); to Isospiridae by Wängberg-Eriksson (1964) and Bouchet et al. (2005); and to Cyrtonellidae by Wagner (2017).
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.