|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Stenolaemata - Cyclostomata - Horneridae
It was assigned to Cyclostomata by Sepkoski (2002); and to Horneridae by Stach (1936), Lee et al. (1997), Bock (2000), Schmidt (2003), Di Martino and Taylor (2014) and Gordon and Taylor (2015).
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.