Agnatha(redirected from agnathans)
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Related to agnathans: Chondrichthyes, Ostracoderms, Placoderms, Chondrichthyans, Gnathostomes, Acanthodians
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|Noun||1.||Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms|
Craniata, 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
Conodonta, Conodontophorida, order Conodonta, order Conodontophorida - extinct order of primitive vertebrates; the precise taxonomy is not clear; in some classifications considered a separate phylum
class - (biology) a taxonomic group containing one or more orders
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