|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Spiriferida - Trigonotretidae
It was reranked as Spirifer (Trigonotreta) by Meek (1877).
It was assigned to Spirifer by Meek (1877); to Spiriferida by Sepkoski (2002); and to Trigonotretinae 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.