what do hagfishes and lampreys have in common with the extinct conodonts?
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These animals have an elongated, eel-like shape, and do not have any paired fins on their sides. Lampreys and hagfishes have gill pouches for ventilation, connected to the external environment by numerous holes or slits on the sides of the body and back of the head. These animals have a simple, cartilaginous skeleton.
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Urochordata and Cephalochordata are two subphyla of the phylum Chordata. Thus, both urochordates and cephalochordates consist of pharyngeal gill slits, a notochord, a dorsal, hollow, nerve cord, and a post-anal tail.
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