出典:Wikipedia
出典:『Wikipedia』 (2010/02/22 04:03 UTC 版)
Claraia is an extinct genus of scallop-like bivalve mollusk that lived from the Capitanian stage of the Late Permian to the Anisian stage of the Middle Triassic, 266-237 million years ago. Fossils have been found worldwide in North America, Europe, Asia, Africa, and Australia. It is a common fossil following the Permian-Triassic boundary, suggesting that it experienced rapid diversification during and after the Permian–Triassic extinction event around 251.4 million years ago.