Eocene Green River Crayfish
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Procambarus primaevus
Green River Formation
Middle Eocene
Lincoln County, Wyoming
This exceptionally reserved specimen is top-rate. The fossil is 3 cm on a 9x8.5 cm matrix. There is no restoration of any kind and the detail is outstanding.
Procambarus is an extant genus of the family Cambaridae whose species mostly prefer warm, fresh, slow-moving rivers or streams, or nearshore marsh habitat. The genus today has about 160 living species ranging through North and Central America. Some specimens of the fossil crayfish have been found with fossil ostracods in their abdominal region indicating that they may have been feeding on these. In the Green River deposits Procambarus is found mostly in the nearshore facies and are not reported from deeper water facies.
$900