Moore, Donald V. Department of Microbiology, Southwestern Medical School, University of Texas, Dallas, Texas.
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A class of the Acanthocephala characterized by the presence of a small number of giant subcuticular nuclei which are similar to the embryonic nuclei. Body spines may or may not be present and the chief lacunar vessels are dorsal and lateral. The cement gland of the male is a single syncytial organ with a specialized cement reservoir. Ligament sacs persist in the female. Proboscis hooks are few in number and arranged in circles. Eggs are ellipsoidal and thin shelled. These worms are parasitic in cold-blooded vertebrates (turtles, fish). The cystacanth occurs in crustaceans.
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