operculum


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o·per·cu·lum

 (ō-pûr′kyə-ləm)
n. pl. o·per·cu·la (-lə) or o·per·cu·lums
Biology A lidlike structure covering an opening, especially:
a. A bony plate that covers and protects the gills of most bony fishes. Also called gill cover.
b. A horny or calcareous plate attached to the foot of most larval and many adult gastropods, used to close the aperture when the animal retracts into its shell.
c. A covering at the top of the spore capsule of most mosses, falling off when mature spores are released.

[Latin, lid, from operīre, to cover; see wer- in Indo-European roots.]

o·per′cu·lar (-lər) adj.

operculum

(əʊˈpɜːkjʊləm) or

opercule

n, pl -la (-lə) or -lums
1. (Zoology) zoology
a. the hard bony flap covering the gill slits in fishes
b. the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn
2. (Botany) botany the covering of the spore-bearing capsule of a moss
3. (Biology) biology any other covering or lid in various organisms
[C18: via New Latin from Latin: lid, from operīre to cover]
oˈpercular, operculate, operculated adj

o•per•cu•lum

(oʊˈpɜr kyə ləm)

n., pl. -la (-lə), -lums.
1. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
2. the gill cover of fishes and amphibians.
[1705–15; < New Latin, Latin: lid, cover]
o•per′cu•lar, adj.

o·per·cu·lum

(ō-pûr′kyə-ləm)
A lid or flap covering an opening, such as the gill cover in some fish or the horny flap covering the opening of a snail.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.operculum - 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 retractedoperculum - 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
plate - any flat platelike body structure or part
Translations
kiduskansi

operculum

[əʊˈpɜːkjʊləm] nopercolo

o·per·cu·lum

n. opérculo.
1. cubierta o tapadera;
2. una de las partes del cerebro que cubre la ínsula.
References in classic literature ?
As this species has a thick calcareous operculum, I removed it, and when it had formed a new membranous one, I immersed it for fourteen days in sea-water, and it recovered and crawled away: but more experiments are wanted on this head.
[6] The large claws or pincers of some of these crabs are most beautifully adapted, when drawn back, to form an operculum to the shell, nearly as perfect as the proper one originally belonging to the molluscous animal.
Miyagawa also notes that when the Old World monkeys speak, they seem to use a part of the brain known as the frontal operculum. Human language is heavily associated with Broca's area, a part of the brain that seems to support more complex operations.
The shallow placing of the muscle scar in Oriostoma may reflect this more globose shell or the well-known occurrence of a heavily calcified operculum (Lindstrom 1884; Peel 2015).
Documented behavioral responses to salt stress include reduced swimming ability and feeding rate (Mann et al., 1991; Chaparro et al., 2008a), and shelled invertebrates react to changes in salinity by sequestering themselves from the outside environment through valve or operculum closure (Shumway, 1977; Berger and Kharazova, 1997; Sokolova et al., 2000; Kim et al., 2001; Chaparro et al., 2008b, 2009) or by producing corporal mucus (McFarlane, 1980).
The patient was cleared for surgery; however, after the patient held her warfarin in preparation for the resection, she suffered a left frontal operculum infarction.
Therefore, initially, it is advisable to attach hemostats to the operculum or have a partner grip the operculum with one hand and brace against the anterior end of the shell with the other hand (Fig.
--Post-otic canal (PO), located right next to the OC, above the preoperculum and the upper end of the operculum. It was connected with the supratemporal and temporal canals (Figs.
pers.) especialmente en el operculum verdoso y la corona externa blanca.
For the floral morphometry analysis, after the complete opening of flowers, 30 random flowers were collected from the 12 plants and, with the aid of a digital caliper and a scaler, length measurements were made between the ends of petals and sepals, flower diameter, androgynophore length and corolla and operculum distance at the level of the axis of anthers.
Role of the gastropod shell and operculum in inhibiting predation by fishes.
In some genera, each locule of the fruit possesses an operculum formed of two symmetrical shutter-like plugs with a median plane of separation.