Parent taxon: Trigonioida according to J. J. Sepkoski 2002
Sister taxa: Actinotrigonia, Anditrigonia, Andivaugonia, Anopisthodon, Antutitrigonia, Arabitrigonia, Asiatotrigonia, Atalantia, Aulacopleurum, Austrotrigonia, Buchotrigonia, Callitrigonia, Climacotrigonia, Columbitrigonia, Cytherodon, Dampietrigonia, Dolabra, Eotrigonia, Erugonia, Eselaevitrigonia, Flattopia, Gobiella, Hefteria, Heslingtonia, Heterotrigonia, Indotrigonia, Iotrigonia, Korobkovitrigonia, Kupenga, Leptotrigonia, Liotrigonia, Litotrigonia, Lyrodesmatacea, Macrotrigonia, Malagastrigonia, Mediterraneotrigonia, Megatrigonia, Mesotrigonia, Myophorellina, Myophorelloidea, Nakanotrigonia, Neuquenenitrigonia, Notoscabrotrigonia, Nototrigonia, Opisthotrigonia, Paranditrigonia, Pisotrigonia, Pleurotrigonia, Procostaria, Promyophorella, Prorotrigonia, Pseudocardinioidea, Pseudomyophorella, Quoiecchia, Rhenania, Sainschandia, Setotrigonia, Silurozodus, Skwarkoella, Sphenotrigonia, Syrotrigonia, Toechomya, Trigoniina, Trigonioidea, Trigonioidoidea, Trigonodoidea, Turkestanella, Virgotrigonia, Yaadia, Yangella, Yeharella, Zaletrigonia, Zulutrigonia
Subtaxa: none
Ecology: facultatively mobile infaunal suspension feeder