Rhynchonellata - Orthida

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

Sister taxa: Angusticardiniidae, Dalmanellidae, Dicoelosiidae, Harknessellidae, Hypsomoniidae, Kayserellidae, Mystrophoridae, Paurorthidae, Platyorthidae, Portranellidae, Proschizophoriidae, Rhipidomellidae, Tyronellidae

Subtaxa: Arenorthis, Cacemia, Cilinella, Heterorthella, Heterorthina, Heterorthis, Incorthis, Marionites, Svobodaina, Tafilaltia, Tarfaya, Tissintia

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Type: Heterorthis

Ecology: stationary epifaunal suspension feeder