{{wiktionary|hypostome}} In zoology, the '''hypostome''' can refer to structures in distinct animal groups:
*Hypostome (trilobite), the ventral mouthpart plate in trilobites *Hypostome (tick), the barbed attachment structure associated with the mouthparts of parasitic arachnids *Hypostome (cnidarian), the oral tip surrounded by tentacles in hydrozoan cnidarians
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