Protothaca (Protothaca) Dall 1902 (venus clam)
Bivalvia - Cardiida - Veneridae
Parent taxon: Protothaca according to E. V. Coan et al. 2000
Sister taxa: Leukoma asperrima, Leukoma beili, Leukoma columbiensis, Leukoma dolicha, Leukoma ecuadoriana, Leukoma grata, Leukoma histrionica, Leukoma laciniata, Leukoma metodon, Leukoma pertincta, Leukoma staleyi, Leukoma staminea, Leukoma thaca, Protothaca (Tropithaca) seymourensis, Protothaca (Novathaca)
Subtaxa: none
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Quaternary of Japan (2 collections)
Total: 2 collections each including a single occurrence