Semelangulus Iredale 1924 (tellin clam)
Bivalvia - Cardiida - Tellinidae
Parent taxon: Tellininae according to H. E. Vokes 1980
Sister taxa: Abranda, Aenona, Angulus, Arcopagella, Arcopaginula, Clathrotellina, Hemimetis, Laciolina, Linearis, Liothyris, Macomona, Moerella, Obtellina, Palaeomoera, Pharaonella, Phylloda, Pinguitellina, Pistris, Pseudarcopagia, Punipagia, Quadrans, Quidnipagus, Scutarcopagia, Solyma, Strigilla, Tellidora, Tellinides, Tellinimera
Subtaxa: Semelangulus tenuilirata
Ecology: facultatively mobile infaunal deposit feeder