chiton


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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.
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, 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 ?
Type species: Chiton cinereus Montagu, 1803, non Linnaeus, 1767 (= Chiton asellus Gmelin, 1791), by subsequent designation (Gray 18476: 168).
Without this funding boost, redevelopments for clubs like Grange and Chiton Rocks would not have been able to commence for another three years.
The paper is focused on the gumboot chiton, the largest type of chiton, which can be up to a foot-long.
Until recently, many scientists thought chitons arose from a more ancient lineage of aplacophorans.
Kisailus, who studies the structures of marine animals for inspiration to develop new materials, has also worked with snails such as the abalone and chiton, as well as sea urchin.
He beckoned us to step in and follow him down below, where before us was revealed Chiton, a chic restaurant which is part of Barcelona's secret dining scene.
Gathered species include abalone, limpet, sea urchin, chiton and barnacle.
Piles of shells from red abalone, giant chiton, mussels and other shellfish also turned up.
admired Odysseus's person (auton), or admired his chiton (also
70E IS A NEWLY DISCOVERED CHITON BROODER ON SANTA CATALINA ISLAND AN UNDESCRIBED SPECIES?
Tap water and a commercial cockatiel seed mix (Kaytee Forti-Diet, Kaytee Products Inc, Chiton, WI, USA) were provided.
Thin sections of the plates of the Pennsylvanian chiton Euleptochiton spatulatus (Hoare, Sturgeon and Hoare 1972) show the pattern and sizes of the aesthete canals.