Difference between revisions of "operculum"
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|definition=1. A lid or flaplike cover. | |definition=1. A lid or flaplike cover. | ||
| − | 2. ([[Annelida]]: Polychaeta) In certain sedentary forms, a modified tentacle that closes the tube; in some Spirorbidae (<i>Pileolaria</i> and <i>Janua</i>) enlarges and serves as a brood pouch. | + | 2. ([[Annelida]]: [[Polychaeta]]) In certain [[sedentary]] forms, a modified [[tentacle]] that closes the [[tube]]; in some Spirorbidae (<i>Pileolaria</i> and <i>Janua</i>) enlarges and serves as a [[brood pouch]]. |
| − | 3. ([[Arthropoda]]) <i>a.</i> In Chelicerata, a plate covering the opening of the book-lungs of spiders. <i>b.</i> In Crustacea, scuta and terga and sometimes associated membrane forming the apparatus occluding an aperture. <i>c.</i> In Diplopoda, a plate-like anterior sclerite of the vulva. <i>d.</i> In [[Insecta]], various plates, flaps and specialized structures of the genital segments. | + | 3. ([[Arthropoda]]) <i>a.</i> In [[Chelicerata]], a plate covering the opening of the book-lungs of spiders. <i>b.</i> In [[Crustacea]], scuta and [[terga]] and sometimes associated [[membrane]] forming the [[apparatus]] occluding an [[aperture]]. <i>c.</i> In [[Diplopoda]], a plate-like [[anterior]] [[sclerite]] of the [[vulva]]. <i>d.</i> In [[Insecta]], various [[plates]], flaps and specialized structures of the [[genital segments]]. |
| − | 4. ([[Bryozoa]]) A generally uncalcified membrane, hinged on its posterior lip that closes the zooidial orifice | + | 4. ([[Bryozoa]]) A generally uncalcified [[membrane]], hinged on its [[posterior]] [[lip]] that closes the zooidial [[orifice]] |
| − | |see also=[[mandible]]. 5. ([[Cnidaria]]: Hydrozoa) A cover sealing the hydrotheca or gonotheca, may be up to four sections; the lid on the distal end of a nematocyst. 6. ([[Mollusca]]) A corneous or calcareous structure borne by the foot serving for closure of the aperture. 7. ([[Platyhelminthes]]) The lid-like opening of an egg-shell. | + | |see also=[[mandible]]. 5. ([[Cnidaria]]: [[Hydrozoa]]) A cover sealing the [[hydrotheca]] or [[gonotheca]], may be up to four sections; the lid on the [[distal]] end of a [[nematocyst]]. 6. ([[Mollusca]]) A [[corneous]] or [[calcareous]] [[structure]] borne by the [[foot]] serving for closure of the [[aperture]]. 7. ([[Platyhelminthes]]) The lid-like opening of an egg-[[shell]]. |
| + | }} | ||
[[Category:Disambiguation page necessary]] | [[Category:Disambiguation page necessary]] | ||
| + | {{Concept scheme relation | ||
| + | |scheme=Dictionary of Invertebrate Zoology | ||
}} | }} | ||
Latest revision as of 23:41, 13 September 2013
operculum (noun; plural opercula; Latin operculum, lid): 1. A lid or flaplike cover.2. (Annelida: Polychaeta) In certain sedentary forms, a modified tentacle that closes the tube; in some Spirorbidae (Pileolaria and Janua) enlarges and serves as a brood pouch.
3. (Arthropoda) a. In Chelicerata, a plate covering the opening of the book-lungs of spiders. b. In Crustacea, scuta and terga and sometimes associated membrane forming the apparatus occluding an aperture. c. In Diplopoda, a plate-like anterior sclerite of the vulva. d. In Insecta, various plates, flaps and specialized structures of the genital segments.
4. (Bryozoa) A generally uncalcified membrane, hinged on its posterior lip that closes the zooidial orifice
See also: mandible. 5. (Cnidaria: Hydrozoa) A cover sealing the hydrotheca or gonotheca, may be up to four sections; the lid on the distal end of a nematocyst. 6. (Mollusca) A corneous or calcareous structure borne by the foot serving for closure of the aperture. 7. (Platyhelminthes) The lid-like opening of an egg-shell.
