chiton


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

chiton

(kī`tən), common name for rock-clinging marine mollusks of the class Polyplacophora. Chitons are abundant on rocky coasts throughout most of the world, from the intertidal zone to a depth of about 1,200 ft (400 m). They range in length from 1-2 in. to 12 in. (1.2–30 cm), according to the species, but most are 1 to 3 in. (2.5–7.5 cm) long. The body of a chiton is low and oval; it is covered dorsally by a slightly convex shell consisting of eight linearly arranged overlapping plates. The shell may be dull or brightly colored. Most of the lower surface consists of a broad, flat foot with which the chiton clings to hard surfaces, often so tightly that a sharp instrument is needed to pry it loose. When dislodged, a chiton rolls into a ball. Beneath the shell is the characteristic molluscan mantle, a fleshy outfolding of the body wall. The lower edge of the mantle, called the girdle, extends below the edge of the shell and aids the foot in gripping. The girdle may be very wide and extend upward over the shell; in some species it is smooth or covered with scales, hairs, or spines that give the animal a shaggy appearance. The many gills are arranged in two rows within the mantle, one on either side of the body. The mouth, located on the ventral surface in front of the foot, contains a toothed, tonguelike scraping organ, the radula. Chitons crawl slowly by means of muscular undulations in the foot. Most are herbivorous, feeding on algae scraped from rocks and shells with the radula; some are carnivorous or omnivorous. Most feed at night and shelter under rock ledges by day. Chitons are 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.
..... Click the link for more information.
, class Polyplacophora, order Polyplacophora.

chiton

[′kīt·ən]
(invertebrate zoology)
The common name for over 600 extant species of mollusks which are members of the class Polyplacophora.
References in periodicals archive ?
Effects of Chiton granosus (Frembly, 1827) and other molluscan grazers on algal succession in wave exposed mid-intertidal rocky shores of central Chile.
They attached a chiton lens to the end of a microscope objective in a water bath.
Using the chiton teeth model has another advantage: engineering nanocrystals can be grown at significantly lower temperatures, which means significantly lower production costs.
Estructura poblacional de Chiton articualtus en las islas Pajaro y Venados de la Bahia de Mazatlan, Sinaloa, Mexico.
Mots cles: connaissances traditionnelles, etude sur le terrain, etude collaborative sur le terrain, ecologie, chiton noir, Katharina tunicata, glace de mer, collaboration, Alutiiq, Inuit
235 as referring to Odysseus and translates it as "him," though grammatically it is equally, if not more, valid to take it as "it," referring to the chiton.
1997), and lamprey GnRH-I (1GnRH-I) and tunicate GnRH-I (tGnRH-I) stimulate spawning and gamete release in the chitons, Mopalia sp.
spatulatus, the collections also contained numerous specimens of four other chiton species.
Yet, since there are other fairly general Dionysian scenes showing Dionysos riding a mule, and a few (though not many) examples of Dionysos in a short chiton (48) one cannot categorically prescribe which of the two protagonists the ancient viewer would have recognised here.
The pressures of millenniums bearing down on silt, loess, leaves, sediments and settlings, mollusca and curd, chiton and crinoid.
She wears a long chiton and is shod in shoes with upturned toes.
Chiton has made progress toward solving their manufacturing problems, but the amount of vaccine the company will provide for the upcoming flu season remains uncertain, and the FDA will continue to evaluate Chiron's activities, according to an FDA statement.