Agnatha

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Related to Jawless vertebrates: jawless fish
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 ?
This is particularly true for the Heterostraci, a widespread group of armoured jawless vertebrates in which the head and forepart of the body are encased in a carapace consisting of a variable number of bony plates, and that are associated with possible non-marine and proximal environments of the Old Red Sandstone continent (see Elliott et al.
Today, the only jawless vertebrates are lampreys and hagfishes, whereas jawed vertebrates number more than fifty thousand species, including ourselves.
Lampreys are jawless vertebrates (agnathans) and the most primitive representatives of the cyclostome branch from which it is feasible to obtain embryos routinely.
Litman next plans to look for novel immune genes in jawless vertebrates, such as lamprey and hagfish.