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Cytomorphological peculiarities of Polypodium hydriforme (Cnidaria)

Published online by Cambridge University Press:  16 October 2008

E.V. Raikova
E.V. Raikova*
Affiliation:
Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Prospect 4, 194064 St Petersburg, Russia
*
Correspondence should be addressed to: E.V. Raikova, Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Prospect 4, 194064 St Petersburg, Russia email: Ekaterina.Raikova@gmail.com
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Abstract

Cytomorphological characters of Polypodium hydriforme—a unique cnidarian, adapted to intracellular parasitism inside oocytes of Acipenseriform fish—are reviewed and analysed. Polypodium's unique characters, those shared with the Myxozoa, and the characters shared with bilateral triploblastic animals are listed. The set of unique features has allowed us to allocate Polypodium to a separate cnidarian class Polypodiozoa Raikova, 1988. The combination of characters displayed by P. hydriforme suggests that this animal is not an aberrant cnidarian, as it was formerly believed, but a relic of a major cnidarian group (class Polypodiozoa) that has undergone reduction due to adaptation to parasitism.

Keywords

cytomorphological peculiaritiesPolypodium hydriformeCnidaria

Information

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1695 - 1702
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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