|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Spiriferida - Delthyrididae
It was reranked as Spirifer (Delthyris) by Khodalevich (1951).
It was assigned to Spirifer by Khodalevich (1951); to Spiriferacea by Kirk and Amsden (1952); to Spiriferida by Sepkoski (2002); and to Delthyridinae by Bassett and Cocks (1974) and Williams et al. (2006).
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.