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Isopoda

Definitions

  • WordNet 3.6
    • n Isopoda woodlice
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Webster's Revised Unabridged Dictionary
    • n. pl Isopoda (Zoöl) An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.☞ The body is usually depressed, with the abdominal segments short, and often consolidated in part. The branchiæ are on the abdominal appendages. The group includes the terrestrial pill bugs and sow bugs, with numerous marine forms. See Arthrostrata Gribble.
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Century Dictionary and Cyclopedia
    • Isopoda An order of arthrostracous or edriophthalmous (sessile-eyed) crustaceans, with 7 free thoracic somites bearing as many pairs of legs, which are alike in size and direction, whence the name; the Polygonata of Fabricius. The body is usually broad and depressed, and more or less arched; the head is almost always distinct from the thorax, except from the first thoracic ring, with which it is united; and the abdomen is short-ringed and often reduced. There are no branchial thoracic vesicles, the respiratory function being carried on by the peculiarly modified laminar legs of the abdomen. The thoracic legs of the females may be modified to form brood-pouches for the eggs by means of delicate membranous plates called oöstegites. The sexes are distinct, except in Cymothoidæ. Isopods are found in both salt and fresh water, and also on land. The terrestrial isopods, family Oniscidæ, are known as sow-bugs, wood-lice, and slaters. The gribble, Limnoria terebrans, is a marine form. Many Isopoda are ectoparasitic, as the Cymothoidæ on the gills and in the mouth of fishes, and the Bopyridæ in the gills of prawns. The order was divided by Milne-Edwards into three sections, Sedentaria, Natatoria, and Cursoria. according to the habits of the animals. By Claus the Isopoda are made a suborder of Arthrostraca, and divided into two tribes, Anisopoda (which resemble amphipods) and Euisopoda, or genuine isopods. Others reckon about ten families, not separated into suborders. Leading types are Tanaidæ and Anceidæ on the one hand, and on the other Cymothoidæ, Sphæromidæ, Idoteidæ, Asellidæ, Bopyridæ, and Oniscidæ.
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Etymology

Webster's Revised Unabridged Dictionary
NL. See Iso-, and -poda

Usage

In literature:

No tracheate Crustacea are known, but some terrestrial Isopoda develop pulmonary in-sinkings of the integument.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6" by Various
In the Decapoda three pairs are thus modified, and in the Tanaidacea, Isopoda and Amphipoda only one.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various
The Woodlice, like some other Isopoda, have a peculiar method of moulting.
"The Life of Crustacea" by William Thomas Calman
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