Polypodium hydriforme

Polypodium is a genus of cnidarians that parasitizes in the eggs of sturgeon and similar fishes (Acipenseridae and Polyodontidae). It is one of the few metazoans (animals) that live inside the cells of other animals.

Polypodium hydriforme
Two specimens of free-living Polypodium
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Cnidaria
Class: Polypodiozoa
Raikova, 1988
Order: Polypodiidea
Poche, 1914
Family: Polypodiidae
Poche, 1914
Genus: Polypodium
Ussov, 1885
Species:
P. hydriforme
Binomial name
Polypodium hydriforme
(Ussov, 1885)

Polypodium hydriforme is the only species of this monotypic genus. The parent family (Polypodiidae), order (Polypodiidea) and class (Polypodiozoa) are also monotypic.

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