Bivalvia - Trigoniida - Megatrigonioidae
Alternative spelling: Acanthotrigonia
Parent taxon: Pterotrigonia according to M. Tashiro and T. Kozai 1982
See also Cox 1952 and Sepkoski 2002
Sister taxa: Pterotrigonia (Pterotrigonia), Pterotrigonia (Ptilotrigonia), Pterotrigonia (Rinetrigonia), Pterotrigonia (Scabrotrigonia), Pterotrigonia (Scabrotrigonia) eufaulensis, Pterotrigonia borgesi, Pterotrigonia crenulata, Pterotrigonia cristata, Pterotrigonia ethra, Pterotrigonia evansana, Pterotrigonia klamathonia, Pterotrigonia oregana, Pterotrigonia vaelsiensis, Pisotrigonia salebrosa, Rinetrigonia ventricosa, Notoscabrotrigonia tocaimaana
Subtaxa: Acanthotrigonia shepstonei Pterotrigonia (Acanthotrigonia) higoensis Pterotrigonia (Acanthotrigonia) mashikensis
Distribution:
• Cretaceous of Angola (2 collections), Japan (15), Mozambique (1)
Total: 18 collections including 23 occurrences