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noun Leptocardia n. pl. (Written also Leptocardii) (Zool.) 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.
Collaborative International Dictionary of English 0.48
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