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CRAYFISH (Fr. ecrevisse)

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Originally appearing in Volume V07, Page 388 of the 1911 Encyclopedia Britannica.
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CRAYFISH (Fr. ecrevisse)  , the name of See also:freshwater crustaceans closely allied to and resembling the lobsters, and, like them, belonging to the See also:order Macrura . They are divided into two families, the Astacidae and Parastacidae, inhabiting respectively the See also:northern and the See also:southern hemispheres . The crayfishes of See also:England and See also:Ireland (Astacus, or Potamobius, pallipes) are generally about 3 or 4 in. See also:long, of a dull See also:green or brownish See also:colour above and paler See also:brown or yellowish below . They See also:Crayfish (Cambarus sp.) from the See also:Mississippi See also:River . (After See also:Morse.) are abundant in some See also:rivers, especially where the rocks are of a calcareous nature, sheltering under stones or in burrows which they dig for themselves in the See also:banks and coming out at See also:night in See also:search of See also:food . They are omnivorous feeders, killing and eating See also:insects, snails, frogs and other animals, and devouring any carrion that comes in their way . It is stated that they sometimes come on See also:land in search of See also:vegetable food . On the See also:continent of See also:Europe, Astacus pallipes occurs chiefly in the See also:west and See also:south, being found in See also:France, See also:Spain, See also:Italy and the 388 See also:Balkan See also:Peninsula . It is known in France as ecrevisse d pattes blanches and in See also:Germany as Steinkrebs, and is little used as food . The larger Astacus fluviatilis (ecrevisse d pattes rouges, Edelkrebs) is not found in See also:Britain, but occurs in France and Germany, southern See also:Sweden, See also:Russia, &c . It is distinguished, among other characters, by the red colour of the under See also:side of the large claws . It is the See also:species most highly esteemed for the table .

Other species of the genus are found in central and eastern Europe and as far See also:

east as See also:Turkestan . Farther east a See also:gap occurs in the See also:distribution and no crayfishes are met with till the See also:basin of the See also:Amur is reached, where a See also:group of species occurs, extending into northern See also:Japan . In See also:North See also:America, west of the Rocky Mountains, the genus Astacus again appears, but east of the See also:watershed it is replaced by the genus Cambarus, which is represented by very numerous species, ranging from the See also:Great Lakes to See also:Mexico . Several See also:blind species inhabit the subterranean See also:waters of caves . The best known is Cambarus pellucidus, found in the See also:Mammoth See also:Cave of See also:Kentucky . The See also:area of distribution occupied by the southern crayfishes or Parastacidae is separated by a broad See also:equatorial See also:zone from that of the northern group, unless, as has been asserted, the two come into contact or overlap in Central America . None is found in any See also:part of See also:Africa, though a species occurs in See also:Madagascar . They are absent also from the See also:oriental region of zoologists, but reappear in See also:Australia and New See also:Zealand . Some of the Australian species, such as the "See also:Murray River See also:lobster" (Astacopsis spinifer), are of large See also:size and are used for food . In South America crayfishes are found in southern See also:Brazil, See also:Argentina and See also:Chile . (W . T .

End of Article: CRAYFISH (Fr. ecrevisse)
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