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 (a.) Of or pertaining to the Leptocardia.

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

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