Rhynchonellata - Terebratulida
Synonym: Dielasmatacea Schuchert 1913 [replaced name]
Parent taxon: Terebratulidina according to A. Williams et al. 2006
See also Brunton and Champion 1974, Dagys 1977 and Feldman 2002
Sister taxa: Cancellothyridoidea, Compositelasmatoidea, Cryptonelloidea, Dyscolioidea, Falciferula, Goliathyris, Loboidothyridoidea, Mayaothyris, Orthotomidae, Pseudorhaetina, Stringocephaloidea, Terebratuloidea, Vex, Zenobiathyridae, Zenobiathyris
Subtaxa: Adygellopsis Angustothyrididae Antzeilleridae Athyrorhynchia Aulacothyroideidae Beecheriidae Dielasmatidae Gillediidae Heterelasminidae Juvavellidae Paradygella Proanadyrella Pseudodielasmatidae Pseudoharttina Pseudopygoides Thyratryaria Zugmayeriidae
Ecology: stationary low-level epifaunal suspension feeder