operculum

[ UK /ˈɒpəkjˌʊləm/ ]
NOUN
  1. a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
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How To Use operculum In A Sentence

  • In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle.
  • Ammonites had an operculum (pl. opercula) as well. French masterclass
  • Other zooids include the avicularia, where the operculum has been modified into a jaw, and the vibracula where the operculum has been modified into a bristle.
  • Immobilizing snails caused them to draw their operculum deep within their shell, which may have restricted the crabs' ability to extract the flesh from the shell, even with extensive apertural breakage.
  • Gently hold the male on his back with one hand to expose his underside, and with the other hand, simultaneously squeeze his body in a direction from behind the operculum to the gonopodial area.
  • Spices translates three Heb. words: (1) sammum, a generic word including galbanum onycha, the operculum of a strombus, and stacte; The Catholic Encyclopedia, Volume 12: Philip II-Reuss
  • Many snails have an operculum, a horny plate that seals the opening when the snail's body is drawn into the shell.
  • The chimaeran hyoid is, it turns out, quite happy supporting the operculum and has no interest in the palatoquadrate.
  • The central region extending between the apophysis and the operculum is composed of sterile tissue and forms the columella (c). Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
  • The archeopyle is created by loss of an operculum that is distinguished from the adjacent cyst surface by a distinct groove.
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