Rhynchonellata - Orthida

Parent taxon: Orthoidea according to A. Williams et al. 2000

Sister taxa: Anomalorthidae, Bohemiellidae, Glyptorthidae, Hesperonomiidae, Hesperorthidae, Lycophoriidae, Orthidiellidae, Plaesiomyidae, Poramborthidae, Productorthidae, Tarfayidae, Whittardiidae, Dolerorthidae

Subtaxa: Diochthofera, Leoniorthis, Orthambonites, Orthinae, Orthis, Orthostrophella, Orthostrophia, Paralenorthis, Sinorthis, Sivorthis, Sulcatorthis, Sulevorthis, Suriorthis, Taphrorthis, Trondorthis

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Type: Orthis

Ecology: stationary epifaunal suspension feeder