| Filter: Genus=%Protothaca%; | Sort by: Accession # Taxon Locality |
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| AccessionNo | Genus | Species | TypeStatus | AuthorDate | Country | State | County | Formation | Age | |
| 66111.01 | Protothaca | staleyi | VOUCHER | Perry, 1988 | USA | California | Santa Cruz | Purisima | MIO-PLIOCENE | Details |
| 68519.00 | Protothaca | staminea | VOUCHER | USA | Alaska | Milky River, marine member | PLIOCENE | Details | ||
| 68520.00 | Protothaca | staminea | VOUCHER | USA | Alaska | Milky River, marine member | PLIOCENE | Details | ||
| 66176.01 | Protothaca | tenerrima | VOUCHER | Perry, 1988 | USA | California | Santa Cruz | Purisima | MIO-PLIOCENE | Details |
| 72558.00 | Protothaca (Callithaca) | tenerrima | VOUCHER | Hertlein & Grant, 1972 | USA | California | San Diego | PLIOCENE | Details | |
| 13659.00 | Protothaca (Tropithaca) | cf. P. (T.) seymourensis | VOUCHER | Hertlein, 1972 | Ecuador | Galapagos | Baltra Is. | PLIOCENE | Details |
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