Rhynchonellata - Terebratulida - Dielasmatidae

Full reference: J. B. Waterhouse. 1982. An Early Permian cool-water fauna from pebbly mudstones in south Thailand. Geological Magazine 119(4):337-354

Parent taxon: Dielasmatinae according to A. Williams et al. 2006

Sister taxa: Adygella, Amygdalocosta, Aspidothyris, Coenothyris, Cruratula, Dareithyris, Dielasma, Dielasmina, Dongbaella, Ectoposia, Fletcherithyris, Pirithyris, Plectelasma, Sulcatinella, Tibetothyris, Tosuhuthyris, Tunethyris, Whitspakia, Yochelsonia

Subtaxa: Elasmata retusus

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Ecology: stationary epifaunal suspension feeder