operculum
(female pleopod(s) II). — A plate over the branchial chamber of the abdomen of female janiroideans, consisting of the fused second pleopods. The first pleopods are absent in female Janiroidea. In males, pleopods I and II lock together to form an operculum somewhat similar to that Seen in the females [Wilson, 1989].
In cirripeds, terga, scuta and associated membranes (Balanomorpha) or tergum and scutum of one side (Verrucomorpha), forming apparatus guarding aperture [Moore and McCormick, 1969].
Scuta and terga (balanomorph) or movable scutum and tergum (verrucomorph) and associated membrane, forming apparatus occluding aperture [McLaughlin, 1980].
(Order Decapoda):
In crab-like (brachyuran) decapod, small, lid-like structure serving to close opening (excretory pore) of antennal gland [Stachowitsch, 1992].
(Order Isopoda):
Protective cover on ventral surface of abdomen (pleon); usually derived from anterior pleopod pair(s) or uropods. See: valve [Stachowitsch, 1992].
(Subclass Cirripedia):
() [Anderson, 1980].
Balanus trigonus: apical view; left lateral view; and operculum, body, and branchiae. [Anderson, 1980]
(Subclass Cirripedia):
In unstalked barnacle, movable, lid-like structure used to close aperture. Consists of symmetrical forms of articulated scutum and tergum closing against opposite scutum and tergum, in asymmetrical forms of movable scutum closing against movable tergum [Stachowitsch, 1992].

Crustacea glossary. . 2011.

Look at other dictionaries:

  • Operculum — may refer to: Operculum (animal), a stiff structure resembling a lid or a small door that opens and closes Operculum (gastropod), a lid on the shell of some gastropods Operculum (bryozoa), a lid on the orifice of some bryozoans Operculum (fish),… …   Wikipedia

  • operculum — 1713, from L. operculum cover, lid, from operire to cover, close (see WEIR (Cf. weir)) …   Etymology dictionary

  • Operculum — O*per cu*lum, n.; pl. L. {Opercula}, E. {Operculums}. [L., a cover or lid, fr. operire to cover.] 1. (Bot.) (a) The lid of a pitcherform leaf. (b) The lid of the urnlike capsule of mosses. [1913 Webster] 2. (Anat.) (a) Any lidlike or operculiform …   The Collaborative International Dictionary of English

  • Opercŭlum — (lat., »Deckel«), s. Tafel »Samenformen«; in der Zoologie der Deckel zum Verschließen der Schale bei den Deckelschnecken (s. Schnecken) …   Meyers Großes Konversations-Lexikon

  • operculum — ► NOUN (pl. opercula) Zoology 1) a flap of skin protecting a fish s gills, typically stiffened by bony plates. 2) a plate that closes the aperture of a gastropod mollusc s shell. ORIGIN Latin, lid, covering …   English terms dictionary

  • operculum — [ō pʉr′kyo͞o ləm, ō pʉr′kyələm] n. pl. opercula [ō pʉr′kyo͞olə, ō pʉr′kyələ] or operculums [ModL < L, lid, dim. < operire, to close, shut: for IE bases see OB & APERTURE] any of various covering flaps or lidlike structures in plants and… …   English World dictionary

  • Operculum — Das Operculum einer marinen Schnecke Ein Operculum (lat. „Deckelchen“, Pl. Opercula) ist ein horniger oder kalkiger Deckel, den die Schnecken aus der Gruppe der Vorderkiemer an der Oberseite ihres Fußes tragen. Damit wird die Mündung des Gehäuses …   Deutsch Wikipedia

  • operculum — n.; pl. opercula [L. 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 …   Dictionary of invertebrate zoology

  • operculum — 1. Anything resembling a lid or cover. 2. [TA] In anatomy, the portions of the frontal (o. frontale [TA], frontal o. [TA]), parietal (o. parietale [TA], parietal o. [TA]), and temporal (o. temporale [TA], temporal o. [TA]) lobes bordering the… …   Medical dictionary

  • Operculum — Oper|cu|lum [...kulum] das; s, ...la <aus lat. operculum »Deckel«> deckelartiger Teil eines Organs (Anat.) …   Das große Fremdwörterbuch

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