Full reference: F. M'Coy. 1844. A synposis of the characters of the Carboniferous limestone fossils of Ireland 1-274
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, Eotrigonia, Erugonia, Eselaevitrigonia, Flattopia, Gobiella, Hefteria, Heslingtonia, Heterotrigonia, Indotrigonia, Iotrigonia, Korobkovitrigonia, Kupenga, Leptotrigonia, Liotrigonia, Litotrigonia, Litschkovitrigonia, 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: Dolabra arcina, Dolabra unilateralis
Ecology: facultatively mobile infaunal suspension feeder