Palaeacanthocephala
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| Palaeacanthocephala | ||||||||||||
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 Proboscis of a Rhadinorhynchus species
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Echinorhynchida |
Palaeacanthocephala ("ancient thornheads") is a class within the phylum Acanthocephala. The adults of these parasitic platyzoans feed mainly on fish, aquatic birds and mammals.
The nuclei of the hyperdermis {outer layer of skin) are fragmented and the males have two to seven cement glands unlike their relatives the Archiacanthocephala which always have eight.
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