The Acanthocephala are readily distinguishable from all other groups of parasitic worms by the possession of an invaginable proboscis, armed with hooks, from which the common name ‘spiney headed’ worm is derived. Acanthocephala do not appear to have been reported from R. pipiens. The best-known species in R. temporaria, R. esculenta and R. ridibunda is Acanthocephalus ranae; a less common species is A. falcatus.
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