chordates

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Definition/MeaningWord/Phrase
superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms Agnatha , superclass Agnatha
genus of chordates in the class Larvacea genus Appendicularia
flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates notochord
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