external muscle (BRYO) A muscle extending from a body wall across the body cavity, to the lophophore or to the gut.
external parameres (ARTHRO: Insecta) All male external genital appendages.
external parasite An ectoparasite.
external respiration The process of gaseous exchange between an organism and its environment.
external secretion Any secretion to the outside of the body or into the cavity of the enteron.
external statocysts (ARTHRO: Insecta) Special hair structures for the retention of the air supply that are adapted to underwater life.
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