peritreme definition

  • noun:
    • That area of the integument of an insect which encompasses the spiracles.
    • The edge of the aperture of a univalve layer.
    • That an element of the integument of an insect which surrounds the spiracles.
    • The edge of the aperture of a univalve shell.
    • In entomology, a tiny circular sclerite, or ring of hard chitinized integument, frequently surrounding the spiracle or breathing-hole of an insect.
    • In conchology, the circumference associated with the aperture of a univalve; a peristome.
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