| n. | 1. | a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct formsCraniata, subphylum Craniata, subphylum Vertebrata, Vertebrata - fishes; amphibians; reptiles; birds; mammals agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms order Ostracodermi, Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear Anaspida, order Anaspida - extinct order of jawless vertebrates Conodonta, Conodontophorida, order Conodonta, order Conodontophorida - extinct order of primitive vertebrates; the precise taxonomy is not clear; in some classifications considered a separate phylum Cyclostomata, order Cyclostomata - primitive jawless aquatic vertebrate: lampreys; hagfishes class - (biology) a taxonomic group containing one or more orders |
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