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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..

Pharyngobranchii :: Pharyngobranchii (n. pl.) Same as Leptocardia.

Dermopterygii :: Dermopterygii (n. pl.) A group of fishlike animals including the Marsipobranchiata and Leptocardia.

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

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..

Leptocardian :: Leptocardian (n.) One of the Leptocardia.

Leptocardian :: Leptocardian (a.) Of or pertaining to the Leptocardia.

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..

Gnathostoma :: Gnathostoma (n. pl.) A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them..

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