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is a parasite from the Acanthocephala phylum with worldwide distribution. parasites are found in pinnipeds as their definitive host. This study aimed to investigate the morphological and molecular characteristics of , and its histopathological effect on the intestinal tissue of . A severe infection was observed in the small intestine of a juvenile male Caspian seal ( ). The morphological descriptions were done using light microscopy, and scanning electron microscopy (SEM). The molecular diagnosis was performed using partial sequences of internal transcribed