Megachasma
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| Order Lamniformes BERG, 1958 |
| Family megacasmidae TAYLOR, COMPAGNO et STRUHSAKER, 1983 |
| Genus megacasma Taylor, COMPAGNO et STRUHSAKER, 1983 |
| Megachasma pelagios TAYLOR, COMPAGNO et STRUHSAKER, 1983: Pliocene, Tomioka Formation, Fukushima Prefecture |
| 9 mm W |
| Megachasma pelagios TAYLOR, COMPAGNO et STRUHSAKER, 1983: Lower Pliocene, Bahia Inglesa Formation to possibly the Upper Miocene,
Atacama Desert, Copiapo, Chile |
| 9.5 mm W |
| "Megachasma" sp.: Early Miocene (Aquitanian), Jewett Sand, Pyramid Hill Sand Member, Pyramid Hill, Kern County, CA |
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20111006 Fumio Nakagawa
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