A body fossil of a thorny-headed worm (Acanthocephala) has been dated to the Jurassic period, about 165 million years ago. It has characteristics of both Acanthocephala and tiny animals called ...
Cameron, T. W. M., "The Internal Parasites of Domestic Animals", 152 (1934). Faust, E. C., "Human Helminthology", 563, 645, 720 (2nd edit., 1939. Mönnig, H. O ...
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