|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Spiriferida - Delthyrididae
It was assigned to Spiriferacea by Kirk and Amsden (1952); to Acrospiriferinae by Bassett and Cocks (1974); to Delthyridinae by Jones (1982); to Spiriferida by Sepkoski (2002); and to Howellellinae by Williams et al. (2006).
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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.