endoparasitic

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en·do·par·a·site

E0136100 (ĕn′dō-păr′ə-sīt′)n. A parasite, such as a tapeworm, that lives within another organism.
en′do·par·a·sit′ic (-sĭt′ĭk) adj.en′do·par′a·sit·ism (-sĭ-tĭz′əm) n.
Thesaurus
Adj.1.endoparasitic - of or relating to parasites that live in the internal organs of animals