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(lp°tkr"d), n. pl.[NL., fr. Gr. lepto°s small + kardi°a the heart.] (Zol.) 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. [Written also Leptocardii.] スポンサード リンク
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