Nerve cells in a parasitic cnidarian Polypodium hydriforme at the parasitic and free-living stages of the life cycle have been localized immunocytochemically using antibodies to FMRF-amide, and their ultrastructure has been described. Ganglion cells form a net under epidermis consisting of bi- and
Polypodium hydriforme, the only species in Polypodiozoa, which is currently considered a class of Cnidaria, and likely a sister group to Medusozoa (together with Myxozoa), is a cnidarian adapted to intracellular parasitism inside sturgeon oocytes. Free-living P. hydriforme lives on river bottoms; it
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