gastropod


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Related to gastropod: Gastropub

gastropod,

member of the class Gastropoda, the largest and most successful class of mollusks (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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), containing over 35,000 living species and 15,000 fossil forms. The shell of gastropods is of one piece (called univalve) and usually coiled or spiraled as in snailssnail,
name commonly used for a gastropod mollusk with a shell. Included in the thousands of species are terrestrial, freshwater, and marine forms. Some eat both plant and animal matter; others eat only one type of food.
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, periwinklesperiwinkle,
any of a group of marine gastropod mollusks having conical, spiral shells. Periwinkles feed on algae and seaweed. They are found at the water's edge; out of water, they resist drying by closing themselves into the shell with a horny plate.
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, conchesconch
, common name for certain marine gastropod 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
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, whelkswhelk,
large marine gastropod snail found in temperate waters. The whelk is sometimes eaten, but when food is plentiful, fishermen frequently use it for bait. Whelks are scavengers and carnivores, equipped with an extensible proboscis, tipped with a filelike radula, with which
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, limpetslimpet,
marine gastropod mollusk with a simple, flattened, conical shell, found in cooler waters of the Atlantic and the Pacific oceans. Certain species creep over rocks, feeding on algae during high tides, but when the tide recedes they return instinctively to the same spot
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, and abalonesabalone
, popular name in the United States for a univalve gastropod mollusk of the genus Haliotis, members of which are also called ear shells, or sea ears, as their shape resembles the human ear.
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; however, in some forms, as in slugsslug,
name for a terrestrial gastropod mollusk in which the characteristic molluscan shell is reduced to a thin plate embedded in the tissues. Like the terrestrial snails of the same order, slugs have a distinct head with a mouth, tentacles bearing eyes, and a lung for breathing
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 and sea slugssea slug,
name for a marine gastropod mollusk that lacks a shell as an adult and is usually brightly colored. Sea slugs, or nudibranchs, are distributed throughout the world, with the greatest numbers and the largest kinds found in tropical waters.
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, it is reduced or completely absent. There is usually a definite head, bearing one or two sensory tentacles and a mouth that is often equipped with a rasplike tongue called a radula. The lower surface of the animal is modified into a large, flattened foot, used by bottom-dwelling forms for creeping about. The foot and other soft parts of the body can usually be completely withdrawn into the shell and the opening covered by a permanent plate called the operculum. Ancient gastropods were probably bilaterally symmetrical, but living species undergo a process known as torsion in which most of the body behind the head rotates 180° so that the anal and urinary openings are relocated behind the head, and the digestive tract and nervous system become U-shaped. Most gastropod species are marine but many groups, notably the pulmonate (lung-bearing) snails, have successfully invaded freshwater and moist terrestrial habitats.

gastropod

, gasteropod
any mollusc of the class Gastropoda, typically having a flattened muscular foot for locomotion and a head that bears stalked eyes. The class includes the snails, whelks, limpets, and slugs
References in periodicals archive ?
The marine gastropod are exploited for food, at the same time the beautiful shape and colour of the shells have attracted and aroused the imagination of man to use them for ornamental purpose also[52].
From gastropod examples: Clanculus, Nassarius, Ancilla, Mitra, Conus, Potamides and Calliostoma.
2005) from 24 specimens of each gastropod species, nine blades or thalli of each macroalgae and seagrass species, and three tunicates were oven-dried for 24 h at 60[degrees]C, and then grounded to fine powder separately.
Among the gastropods, however, current data are minimal for interspecific and intraspecific scaling relationships.
But cold weather does hinder gastropod activity, and at freezing temperatures they hibernate.
Alternatively, n-Ag may bind to and alter kairomones released by sunfish predators, thereby blocking predator cue effectiveness, or n-Ag may modify the conformation of gastropod olfactory receptors (Wojtasek and Leal, 1999).
The presence or absence of certain gastropod species could be attributed to the influence of environmental conditions, including soil and climatic parameters [29, 30].
In the present study, a total of 53 gastropod taxa associated with Ulva spp.
The gastropod population showed a positive correlation with the temperature, TDS, electric conductivity, hardness and salinity.
Elimia livescens is a freshwater gastropod that occupies a wide range of habitats and has high morphological variation that covaries with abiotic environmental variables (Dunithan et al.
From Red and Mediterranian Seas concentrations of 18:1 n-9 and 18:1 n-7 and 20:1 n-9 were reported in eight marine gastropod species [4].