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501554 Valvata montenegrina Valvata sp. PR.02a Valvata klemmi Valvata stenotrema Valvata sp. PR.01a Valvata rhabdota Valvata utahensis Valvata humeralis Valvata relicta Valvata cristata
0 2.63 5 8 10 Time (MYA)
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