|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Spiriferida - Spiriferidae
It was reranked as Spirisosium by Muir-Wood and Cooper (1960), Williams et al. (2000) and Sepkoski (2002).
It was assigned to Spirifer by de Gregorio (1930); to Echinosteginae by Muir-Wood and Cooper (1960) and Williams et al. (2000); and to Strophomenida by Sepkoski (2002).
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.