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Peremistocrinus from the Dewey Limestone Formation, Oklahoma

, : Peremistocrinus from the Dewey Limestone Formation, Oklahoma. Geol Mag 85(2): 113-116

Of 58 specimens of this Pennsylvanian crinoid, only 22 retain the primitive anal plate pattern, the others showing modifications toward separation of the anal plates from the basals. Most of the specimens are of P. impressus.


DOI: 10.1017/s0016756800072885

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Karger, S.; Arlt, S.; Haimerl, P.; Heuwieser, W., 2014: A systematic review of studies performing the hypo-osmotic swelling test to evaluate the quality of canine spermatozoa. The hypo-osmotic swelling test (HOS test) is a simple and inexpensive test to evaluate the functional integrity of sperm cell membranes. According to the existing literature, its simple applicability has turned it into a valuable additional parame...

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