|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Spiriferida - Ambocoeliidae
It was assigned to Delthyridacea by George (1931); to Cyrtiacea by Brunton and Champion (1974); to Spiriferacea by Savage et al. (1978); to Cyrtioidea by Savage and Baxter (1995); and to Ambocoelioidea by Williams et al. (2006) and Boucot et al. (2008).
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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.