conch


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conch

(kŏngk, kŏnch, kôngk), common name for certain marine gastropodgastropod,
member of the class Gastropoda, the largest and most successful class of mollusks (phylum Mollusca), containing over 35,000 living species and 15,000 fossil forms.
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 mollusks having a heavy, spiral shell, the whorls of which overlap each other. In conchs the characteristic gastropod foot is reduced in size and the operculum, a horny plate located on the foot and used to seal the shell opening in many gastropods, has the appearance and function of a claw. During locomotion, the operculum secures a foothold in the sand, and the conch jumps forward by means of the quick contraction of a retractor muscle called the columella muscle. Thus the conch lacks the creeping motion of most gastropods. The king conch, Strombus gigas, found in the warmer waters of the Atlantic, Caribbean, and Gulf of Mexico, has a shell 10 to 12 in. (25–30 cm) long and may weigh up to 5 lb (2.3 kg). Similar in size and distribution is the queen conch, Cassis cameo. Its shell has been used in Europe to carve cameos. Conch shells range in color from white to red; they have been used by humans to fashion a number of items, such as buttons, ornaments, or the crude trumpets made from the shell of the trumpet conch, Charonia tritonis. This conch is similar in shape to the king and queen conchs but is much more slender and reaches a length of 20 in. (50 cm). C. tritonis is found in the Gulf of Mexico and the Indian Ocean. The largest conch and also one of the largest univalves in the world is the horse conch, Pleuroploca gigantea, having a shell length of 24 in. (60 cm). It is found along the Atlantic Coast from North Carolina to Brazil. The body can retreat entirely into the shell and remain there for months if unfavorable conditions prevail. An unusual conch shell is that of the spider conch, Lambis lambis, which has leglike projections. Spider conchs are voracious carnivores, common on coral reefs. They also feed on algae, as do the king conchs. Most conchs are carnivorous, feeding on bivalve mollusks; some are scavengers as well. They inhabit tropical waters and have been used as a food source for man. The conch is classified in the phylum MolluscaMollusca
, taxonomic name for the one of the largest phyla of invertebrate animals (Arthropoda is the largest) comprising more than 50,000 living mollusk species and about 35,000 fossil species dating back to the Cambrian period.
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, class Gastropoda, order Mesogastropoda.

Conch

Semidome vaulting of an apse or eastern end of a church.

conch

[käŋk]
(invertebrate zoology)
The common name for several species of large, colorful gastropod mollusks of the family Strombidae; the shell is used to make cameos and porcelain.

conch

The domed roof of a semicircular apse.

conch

1. any of various tropical marine gastropod molluscs of the genus Strombus and related genera, esp S. gigas (giant conch), characterized by a large brightly coloured spiral shell
2. the shell of such a mollusc, used as a trumpet
References in periodicals archive ?
Conservation and management of queen conch (Strombus gigas) fisheries in the Caribbean.
The two China largest cement producers CNBM and Conch Cement had controlled 73.0% of total clinker capacity in Anhui last year.
The literature describing known lesions of the queen conch can be summarized as follows.
It was slightly tongue in cheek, with the mayor declaring that their policy was to bring 'humour, warmth and respect' to the Conch Republic, named after the shell found locally.
The Keys celebrate setting up their own "Conch Republic", when they broke away from rule by Washington DC.
Shell shape variation of queen conch Strombus gigas (Mesograstropoda: Strombidae) from Southwest Caribbean
It is estimated that 15 million conch were exported annually until the late 1960s (Rudd 2003).
The sea snails save their jumping for conch emergencies, such as when they detect dissolved body odor from the deadly cone snail Conus marmoreus.
Strombus gigas is the host mollusc for conch pearls, and indeed pink and orange coral beads are occasionally mistaken for conch pearls (Farn, 1986, cited by Fritsch and Misiorowski, 1987).
It wasn't immediately clear how much fish the boat was carrying some 80 miles (128 kilometers) south of Andros, where conch, lobster and snapper are the mainstay of the local economy.
This novel for young readers concerns two young girls, Sam and Melody, who are thrust into an adventure in an alternate universe in cyberspace when a magic conch shell is stolen from Sam's mother's cafe on the beach.