†Pachyrisma (Pachymegalodon) Gümbel 1862 (clam)
Bivalvia - Megalodontida - Megalodontidae
Alternative spellings: Pachymegalodon, Pachymegalodus
Parent taxon: Pachyrisma according to L. R. Cox et al. 1969
See also Krumbeck 1923 and Sepkoski 2002
Sister taxa: Pachyrisma (Durga), Pachyrisma (Pachyrismella), Pachyrisma grande, Pachyrisma rimosum, Pachyrisma rostratum
Subtaxa: Pachymegalodus nimassicus Pachymegalodus timorensis
Ecology: stationary semi-infaunal suspension feeder
Distribution: