Rhynchonellata - Terebratulida - Cryptonellidae

Full reference: G. A. Cooper and R. E. Grant. 1976. Permian Brachiopods of west Texas, V. Smithsonian Contributions to Paleobiology 24:2609-3159

Belongs to Heterelasma according to G. A. Cooper and R. E. Grant 1976

Sister taxa: Dielasma (Heterelasma) semitarium, Heterelasma angulatum, Heterelasma concavum, Heterelasma contortum, Heterelasma contrerasi, Heterelasma geniculatum, Heterelasma gibbosum, Heterelasma glansfagea, Heterelasma lenticularia, Heterelasma magnum, Heterelasma ngariensis, Heterelasma quadratum, Heterelasma shumardianum, Heterelasma solidum, Heterelasma sulciplicatum, Heterelasma venustulum

Type specimen: USNM 153406b, a shell (Articulated shell)

Ecology: stationary epifaunal suspension feeder

Average measurements (in mm): shell 11.1 x 9.6