Agnatha

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Related to Jawless fishes: superclass Agnatha, Cartilaginous fishes
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreysAgnatha - 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
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
References in periodicals archive ?
Like many scale-bearing sharks and bony fishes, most extinct, jawless fishes possessed articulating dermal bones that were suggested to be adaptations against predators (Carroll, 1988).
Friedman told Discovery News that some fossil jawless fishes "had broad, shovel-shaped heads with their eyes placed on top, while others had narrow bodies and skulls with their eyes on either side of the head.
Numerous jawless fishes characteristic of the Siberian Early Devonian, amphiaspidids, come mostly from the Siberian Platform, also from the adjacent Tajmyr Peninsula.