English definition of Amphioxus

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Definition of amphioxus

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Amphioxus (n.) A fishlike creature (Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebrae, nor red blood. It forms the type of the group Acrania, Leptocardia, etc..

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Stigma :: Stigma (v. t.) One of the apertures of the gill of an ascidian, and of Amphioxus..

Cirrostomi :: Cirrostomi (n. pl.) The lowest group of vertebrates; -- so called from the cirri around the mouth; the Leptocardia. See Amphioxus.

Acrania :: Acrania (n.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists..

Vertebrata :: Vertebrata (n. pl.) One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebrae, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone, and a ventral, or visceral, cavity below it. The subdivisions or classes of Vertebrata are Mammalia, Aves, Reptilia, Amphibia, Pisces, Marsipobranchia, and Lep

Amphioxus :: Amphioxus (n.) A fishlike creature (Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebrae, nor red blood. It forms the type of the group Acrania, Leptocardia, etc..

Epicoele :: Epicoele (n.) A cavity formed by the invagination of the outer wall of the body, as the atrium of an amphioxus and possibly the body cavity of vertebrates..

Leptocardia :: Leptocardia (n. pl.) The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colorless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See Amphioxus..

Lancelet :: Lancelet (n.) A small fishlike animal (Amphioxus lanceolatus), remarkable for the rudimentary condition of its organs. It is the type of the class Leptocardia. See Amphioxus, Leptocardia..

Branchiostoma :: Branchiostoma (n.) The lancelet. See Amphioxus.