|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Spiriferida - Xenomartiniidae
It was reranked as Delthyris (Quadrithyris) by Havlicek (1959).
It was assigned to Delthyris by Havlicek (1959); to Spiriferida by Sepkoski (2002); and to Quadrithyridinae by 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.