Rhynchonellata - Protorthida

Parent taxon: Rhynchonellata according to M. Rubel 2011

See also Benedetto 2003, Hansen and Holmer 2011, Williams et al. 2000 and Zhan and Jin 2005

Sister taxa: Athyridida, Atrypida, Cadomelloidea, Cardiarinidae, Dentatrypa, Mongolellidae, Orthida, Pentamerida, Rhynchonellida, Spiriferida, Spiriferinida, Terebratulida, Thecideida, Tropidoleptidae

Subtaxa: Protorthoidea Skenidioidea

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Ecology: stationary low-level epifaunal suspension feeder

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