The parasitic coelenterate, Polypodium hydriforme Ussov, from the eggs of the American acipenseriform Polyodon Spainthula
No significant differences in macro- and micromorphology were found between the parasitic stolon and free-living polyps of Polypodium sp. obtained from infected eggs of the North American acipenseriform fish Polyodon spathula and corresponding developmental stages of Polypodium hydriforme Ussov, parasitic in the Volga sterlet ( Acipenser ruthenus ). Therefore, both the American and the European forms of Polypodium belong to the species P. hydriforme Ussov.
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