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- Agnatha abstract "Agnatha (Greek, "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group excludes all vertebrates with jaws, known as gnathostomes.The agnathans as a whole are paraphyletic, because most extinct agnathans belong to the stem group of gnathostomes. Recent molecular data, both from rRNA and from mtDNA as well as embryological data strongly supports the hypothesis that living agnathans, the cyclostomes, are monophyletic.The oldest fossil agnathans appeared in the Cambrian, and two groups still survive today: the lampreys and the hagfish, comprising about 120 species in total. Hagfish are considered members of the subphylum Vertebrata, because they secondarily lost vertebrae; before this event was inferred from molecular and developmental data, the group Craniata was created by Linnaeus (and is still sometimes used as a strictly morphological descriptor) to reference hagfish plus vertebrates. In addition to the absence of jaws, modern agnathans are characterised by absence of paired fins; the presence of a notochord both in larvae and adults; and seven or more paired gill pouches. Lampreys have a light sensitive pineal eye (homologous to the pineal gland in mammals). All living and most extinct Agnatha do not have an identifiable stomach or any appendages. Fertilization and development are both external. There is no parental care in the Agnatha class. The Agnatha are ectothermic or cold blooded, with a cartilaginous skeleton, and the heart contains 2 chambers.While a few scientists still regard the living agnathans as only superficially similar, and argue that many of these similarities are probably shared basal characteristics of ancient vertebrates, recent classifications clearly place hagfish (the Myxini or Hyperotreti), with the lampreys (Hyperoartii) as being more closely related to each other than either is to the jawed fishes.".
- Agnatha thumbnail Lampetra_fluviatilis.jpg?width=300.
- Agnatha wikiPageID "189055".
- Agnatha wikiPageLength "23479".
- Agnatha wikiPageOutDegree "178".
- Agnatha wikiPageRevisionID "681316503".
- Agnatha wikiPageWikiLink Agnatha.
- Agnatha wikiPageWikiLink Amphirhina.
- Agnatha wikiPageWikiLink Anaspida.
- Agnatha wikiPageWikiLink Animal.
- Agnatha wikiPageWikiLink Anticoagulant.
- Agnatha wikiPageWikiLink Appendage.
- Agnatha wikiPageWikiLink Appendages.
- Agnatha wikiPageWikiLink Arandaspida.
- Agnatha wikiPageWikiLink Armour_(anatomy).
- Agnatha wikiPageWikiLink Armour_(zoology).
- Agnatha wikiPageWikiLink Astraspida.
- Agnatha wikiPageWikiLink Basal_(evolution).
- Agnatha wikiPageWikiLink Basal_(phylogenetics).
- Agnatha wikiPageWikiLink Bony_fish.
- Agnatha wikiPageWikiLink British_Columbia.
- Agnatha wikiPageWikiLink Burgess_Shale.
- Agnatha wikiPageWikiLink Cambrian.
- Agnatha wikiPageWikiLink Carl_Linnaeus.
- Agnatha wikiPageWikiLink Cartilage.
- Agnatha wikiPageWikiLink Category:Agnatha.
- Agnatha wikiPageWikiLink Caudal_fin.
- Agnatha wikiPageWikiLink Cephalaspidomorphi.
- Agnatha wikiPageWikiLink Cephalaspis.
- Agnatha wikiPageWikiLink China.
- Agnatha wikiPageWikiLink Chordata.
- Agnatha wikiPageWikiLink Chordate.
- Agnatha wikiPageWikiLink Class_(biology).
- Agnatha wikiPageWikiLink Conodont.
- Agnatha wikiPageWikiLink Conodonts.
- Agnatha wikiPageWikiLink Convergent_evolution.
- Agnatha wikiPageWikiLink Craniata.
- Agnatha wikiPageWikiLink Craniate.
- Agnatha wikiPageWikiLink Crown_group.
- Agnatha wikiPageWikiLink Cyclostomata.
- Agnatha wikiPageWikiLink Devonian.
- Agnatha wikiPageWikiLink Ectotherm.
- Agnatha wikiPageWikiLink Ectothermic.
- Agnatha wikiPageWikiLink Edward_Drinker_Cope.
- Agnatha wikiPageWikiLink Eel.
- Agnatha wikiPageWikiLink Endeiolepis.
- Agnatha wikiPageWikiLink Euphanerops.
- Agnatha wikiPageWikiLink European_river_lamprey.
- Agnatha wikiPageWikiLink Extant_taxon.
- Agnatha wikiPageWikiLink Extinction.
- Agnatha wikiPageWikiLink Fauna.
- Agnatha wikiPageWikiLink Fauna_(animals).
- Agnatha wikiPageWikiLink Fin.
- Agnatha wikiPageWikiLink Fish_fin.
- Agnatha wikiPageWikiLink Fish_jaw.
- Agnatha wikiPageWikiLink Fossil.
- Agnatha wikiPageWikiLink Galeaspid.
- Agnatha wikiPageWikiLink Galeaspida.
- Agnatha wikiPageWikiLink Gill.
- Agnatha wikiPageWikiLink Gnathostomata.
- Agnatha wikiPageWikiLink Gnathostome.
- Agnatha wikiPageWikiLink Gnathostomes.
- Agnatha wikiPageWikiLink Greek_Language.
- Agnatha wikiPageWikiLink Greek_language.
- Agnatha wikiPageWikiLink Hagfish.
- Agnatha wikiPageWikiLink Haikouella.
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- Agnatha wikiPageWikiLink Heterostraci.
- Agnatha wikiPageWikiLink Human.
- Agnatha wikiPageWikiLink Hyperoartia.
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- Agnatha wikiPageWikiLink Hypocercal_tail.
- Agnatha wikiPageWikiLink Jamoytiiformes.
- Agnatha wikiPageWikiLink Jaw.
- Agnatha wikiPageWikiLink Lampetra_fluviatilis.
- Agnatha wikiPageWikiLink Lamprey.
- Agnatha wikiPageWikiLink Lampreys.
- Agnatha wikiPageWikiLink Lancelet.
- Agnatha wikiPageWikiLink Lancelets.
- Agnatha wikiPageWikiLink Late_Devonian_extinction.
- Agnatha wikiPageWikiLink Lateral_line.
- Agnatha wikiPageWikiLink Linnaeus.
- Agnatha wikiPageWikiLink Living_fossil.
- Agnatha wikiPageWikiLink Living_fossils.
- Agnatha wikiPageWikiLink Mammal.
- Agnatha wikiPageWikiLink Maotianshan_Shales.
- Agnatha wikiPageWikiLink Maotianshan_shales.
- Agnatha wikiPageWikiLink Mesozoic.
- Agnatha wikiPageWikiLink Monophyletic.
- Agnatha wikiPageWikiLink Monophyly.
- Agnatha wikiPageWikiLink Myllokunmingia.
- Agnatha wikiPageWikiLink Myxini.
- Agnatha wikiPageWikiLink Neontology.
- Agnatha wikiPageWikiLink Notochord.
- Agnatha wikiPageWikiLink Ordovician.
- Agnatha wikiPageWikiLink Osteichthyes.
- Agnatha wikiPageWikiLink Osteostracan.