Agnatha

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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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The assemblages of the Middle Devonian psammosteid agnathans from the eastern part of the Main Devonian Field.
Silurian-Devonian vertebrate-dominated communities, with particular reference to agnathans. In Paleocommunities: a case study from the Silurian and Lower Devonian.
In Reproductive biology and Phylogeny of fishes (agnathans and bony fishes), vol.
Jamieson (Ed.), Reproductive Biology and Physiology of Fishes (Agnathans and Bony Fishes) (pp.
Thus, the growth-promoting and osmoregulatory properties of the single hormone remained unchanged in agnathans. Further comparative and functional studies of GH and PRL will shed more light on the divergence and development of these structurally and functionally related hormones and their receptors.
Nebulin is a thin filament protein of the cardiac muscle of the agnathans. J.
70-92) summarizes the distribution of aquaporins in the major osmoregulatory organs of teleosts, elasmobranchs, and agnathans, such as the gills, intestine, and kidney.
Naseka, Catalogue of Agnathans and Fishes of Fresh and Brackish Waters of Russia with Comments on Nomenclature and Taxonomy, KMK Scientific Press Ltd, Moscow, Russia, 2004.
Between jawless vertebrates -- called agnathans -- and vertebrates with jaws-called gnathosomes-only three genes of the 12 genes the team looked at appeared to be used differently, Medeiros said.