Bivalvia - Cardiida - Cardiidae
Parent taxon: Protocardia according to Guo 1988
Sister taxa: Cardium (Protocardia) arkansense, Cardium (Protocardia) pauli, Cardium (Protocardium) granuliferum, Protocardia (Leptocardia), Protocardia (Pachycardium), Protocardia (Protocardia), Protocardia (Tamilicardia), Protocardia alcesiana, Protocardia buckmani, Protocardia costaricensis, Protocardia dufrenoyca, Protocardia eduliformis, Protocardia gambrina, Protocardia hillana, Protocardia intexta, Protocardia lingulata, Protocardia luggudensis, Protocardia newberryana, Protocardia peregrinorsa, Protocardia pesolina, Protocardia philippiana, Protocardia piettei, Protocardia placerensis, Protocardia pulchella, Protocardia qinghaiensis, Protocardia razavii, Protocardia rhaetica, Protocardia salrivalis, Protocardia somaliensis, Protocardia stantoni, Protocardia stonei, Protocardia striatula, Protocardia stricklandi, Protocardia subquadrata, Protocardia texanum, Protocardia translucida, Protocardia truncata, Protocardia umkwelanensis, Protocardia virginiana, Protocardium (Brevicardium)
Subtaxa: Protocardia (Grypocardia) gryphaeata
Type: Protocardia (Grypocardia) gryphaeata
Ecology: facultatively mobile infaunal suspension feeder
Distribution: found only at Yueliangping, Jianchuan (Maichuqing Formation) (Triassic of China)