Ichthyopsida

Definitions

  • Webster's Revised Unabridged Dictionary
    • n. pl Ichthyopsida (Zoöl) A grand division of the Vertebrata, including the Amphibia and Fishes.
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Century Dictionary and Cyclopedia
    • ichthyopsida One of three primary groups or provinces of vertebrates in Huxley's classification (the other two being Sauropsida and Mammalia), comprising the amphibians or batrachians and the fish and fish-like vertebrates; the branchiate or anamniotic Vertebrata. They have no amnion, and at most a rudimentary allantois, and breathe by gills during a part or the whole of life. They have urinary organs in the form of persistent Wolffian bodies; a tubular, bilocular, or at most a trilocular heart; never fewer than two aortic arches in the adult; nucleated blood-corpuscles; and no diaphragm, corpus callosum, or mammary glands. Also called Branchiata, Branchiotoca.
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Chambers's Twentieth Century Dictionary
    • n.pl Ichthyopsida ik-thi-op′si-da one of three primary groups of vertebrates in Huxley's classification (the other two, Sauropsida and Mammalia), comprising the amphibians or batrachians and the fish and fish-like vertebrates.
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. 'ichqy`s -y`os, a fish + appearance
Chambers's Twentieth Century Dictionary
Gr. ichthys, fish, opsis, appearance.