Agnatha

See also: agnatha

Translingual

Hagfishes have spinal columns and skulls like the gnathostomes, but are jawless, with rounded mouthparts, adapted to rasping and sucking

Etymology

From Ancient Greek ἀ- (a-, “without”) + γνάθος (gnáthos, “jaw”).

Proper noun

Agnatha

The jawless fishes, or agnathans; they have backbones and skulls like the scaly fishes, and like reptiles, mammals and other vertebrates on land, but they do not have paired jaws like humans or sharks; instead their mouthparts are round; they suck onto their prey or food and rasp away bits that they then swallow.
1. A taxonomic superclass within the subphylum Vertebrata.
  - 1889, Edward Drinker Cope, "Synopsis of the Families of Vertebrata", The American Naturalist, volume 23, page 852:
    The known members of the class Agnatha are a very small representation of those that once existed; and they present a great variety of character, having little affinity with each other.
  - 2007, Chad Thomas et al., Freshwater Fishes of Texas, Texas A&M University Press, page 6:
    Current classification schemes have living fishes assigned to two superclasses (Agnatha, or jawless chordates, and Gnathostomata, or jawed chordates)[…].
2. A taxonomic infraphylum within the subphylum Vertebrata.[1]

Hypernyms

(superclass): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Deuterostomia – infrakingdom; Chordata – phylum; Chordata Craniata - clade
(infraphylum): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Deuterostomia – infrakingdom; Chordata – phylum; Vertebrata - subphylum[1]

Hyponyms

(subphylum): Myxini, †Cephalaspidomorphi, †Pteraspidomorphi - classes
(infraphylum): Cyclostomata[1]

Coordinate terms

Gnathostomata

Descendants

agnatha
agnathan

References

Agnatha on Wikipedia.Wikipedia
Agnatha on Wikispecies.Wikispecies
Agnatha on Wikimedia Commons.Wikimedia Commons
Hyperotreti at the Tree of Life Web Project
Agnatha at Paleology Database

Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. (2015) A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e0119248. doi: 10.1371/journal.pone.0119248. pmid:25923521

[Ruggiero-1] Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. (2015) A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e0119248. doi: 10.1371/journal.pone.0119248. pmid:25923521

单词	Agnatha
释义	Agnatha See also: agnatha Translingual Hagfishes have spinal columns and skulls like the gnathostomes, but are jawless, with rounded mouthparts, adapted to rasping and sucking Etymology From Ancient Greek ἀ- (a-, “without”) + γνάθος (gnáthos, “jaw”). Proper noun Agnatha The jawless fishes, or agnathans; they have backbones and skulls like the scaly fishes, and like reptiles, mammals and other vertebrates on land, but they do not have paired jaws like humans or sharks; instead their mouthparts are round; they suck onto their prey or food and rasp away bits that they then swallow. A taxonomic superclass within the subphylum Vertebrata. 1889, Edward Drinker Cope, "Synopsis of the Families of Vertebrata", The American Naturalist, volume 23, page 852: The known members of the class Agnatha are a very small representation of those that once existed; and they present a great variety of character, having little affinity with each other. 2007, Chad Thomas et al., Freshwater Fishes of Texas, Texas A&M University Press, page 6: Current classification schemes have living fishes assigned to two superclasses (Agnatha, or jawless chordates, and Gnathostomata, or jawed chordates)[…]. A taxonomic infraphylum within the subphylum Vertebrata.[1] Hypernyms (superclass): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Deuterostomia – infrakingdom; Chordata – phylum; Chordata Craniata - clade (infraphylum): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Deuterostomia – infrakingdom; Chordata – phylum; Vertebrata - subphylum[1] Hyponyms (subphylum): Myxini, †Cephalaspidomorphi, †Pteraspidomorphi - classes (infraphylum): Cyclostomata[1] Coordinate terms Gnathostomata Descendants agnatha agnathan See also Ostracodermi References Agnatha on Wikipedia.Wikipedia Agnatha on Wikispecies.Wikispecies Agnatha on Wikimedia Commons.Wikimedia Commons Hyperotreti at the Tree of Life Web Project Agnatha at Paleology Database Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. (2015) A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e0119248. doi: 10.1371/journal.pone.0119248. pmid:25923521
随便看	quinquetuberculate quinquevalence quinquevalency quinquevalent quinquevalve quinquevalvular quinquevir quinqueviral quinquevirale quinqueviralem quinquevirales quinquevirali quinqueviralia quinqueviralibus quinqueviralis quinqueviralium quinquevirate quinquevirates quinqueviratibus quinquevirato quinqueviratu quinqueviratui quinqueviratum quinqueviratus quinqueviratuum