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Only 8 amphilinid species are known. The amphilinids are large worms (several cm long) which,in contrast to the true tapeworms (Eucestoda), have a flattenedleaf-like body that is not divided into proglottids (false "segments").Larvae have 10 peculiarly shaped hooks of several types at theposterior end, which are retained by the adult. They are parasitesin the body cavity of freshwater and marine teleost fishes andfreshwater turtles (Dubinina, 1982). They have little economicsignificance, although one species was shown to affect sturgeon,the producers of caviar, adversely. Amphilinids are of considerableinterest to biologists, because they may cast light on the phylogenyof tapeworms and of related forms. Most studies deal with thetaxonomy as well as the light- and electron microscopic structureof a few species.Life cycles are known only for a few species and little is known of their effects on the host.

A key to the species of Amphilinidea is available here.


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