mound nest (ARTHRO) Nest or part of one built above ground of soil or carton material.
mouse unit (MOLL: Bivalvia) A unit of measurement employed as a gradient of shellfish poisoning.
mouth-anus axis (MOLL: Bivalvia) In oysters, a line through the mouth and anus.
mouth capsule see buccal cavity mouth cirri (ARTHRO: Crustacea) In Cirripedia, the first pair of modified cirri.
mouth cone (ARTHRO: Insecta) The rostrum; proboscis, prostomium.
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