Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Gnathostomata> ?p ?o }
- Gnathostomata abstract "Gnathostomata /ˌneɪθoʊstoʊˈmɑːtə/ are the jawed vertebrates. The term derives from Greek: γνάθος (gnathos) \"jaw\" + στόμα (stoma) \"mouth\". Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all living vertebrates. In addition to opposing jaws, living gnathostomes also have teeth, paired appendages, and a horizontal semicircular canal of the inner ear, along with physiological and cellular anatomical characters such as the myelin sheathes of neurons. Another is an adaptive immune system that uses V(D)J recombination to create antigen recognition sites, rather than using genetic recombination in the variable lymphocyte receptor gene.It is now assumed that Gnathostomata evolved from ancestors that already possessed a pair of both pectoral and pelvic fins. In addition to this, some placoderms were also shown to have a third pair of paired appendages, that in males had been modified to claspers and basal plates in females, a pattern not seen in any other vertebrate group.New fossil finds suggest that thelodonts are the closest relatives of the Gnathostomata.It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively – the buccal pump mechanism. The mouth could then grow bigger and wider, making it possible to capture larger prey. This close and open mechanism would, with time, become stronger and tougher, being transformed into real jaws.Newer research suggests that a branch of Placoderms was most likely the ancestor of present-day gnathostomes. A 419-million-year-old fossil of a placoderm named Entelognathus had a bony skeleton and anatomical details associated with cartilaginous and bony fish, demonstrating that the absence of a bony skeleton in Chondrichthyes is a derived trait. The fossil findings of primitive bony fishes such as Guiyu oneiros and Psarolepis, which lived contemporaneously with Entelognathus and had pelvic girdles more in common with placoderms than with other bony fish, show that it was a relative rather than a direct ancestor of the extant gnathostomes. It also indicates that spiny sharks and Chondrichthyes represent a single sister group to the bony fishes. Fossils findings of juvenile placoderms, which had true teeth that grew on the surface of the jawbone and had no roots, making it impossible to replace or regrow as they broke or wore down as they grew older, proves the common ancestor of all gnathostomes had teeth and place the origin of teeth along with, or soon after, the evolution of jaws.Late Ordovician-aged microfossils of what have been identified as scales of either acanthodians or \"shark-like fishes\", may mark Gnathostomata's first appearance in the fossil record. Undeniably unambiguous gnathostome fossils, mostly of primitive acanthodians, begin appearing by the early Silurian, and become abundant by the start of the Devonian.".
- Gnathostomata thumbnail DunkleosteusSannoble.JPG?width=300.
- Gnathostomata wikiPageExternalLink tree?group=Gnathostomata&contgroup=Vertebrata.
- Gnathostomata wikiPageExternalLink Meckelian.html.
- Gnathostomata wikiPageID "211426".
- Gnathostomata wikiPageLength "15709".
- Gnathostomata wikiPageOutDegree "135".
- Gnathostomata wikiPageRevisionID "700275381".
- Gnathostomata wikiPageWikiLink Acanthodes.
- Gnathostomata wikiPageWikiLink Acanthodii.
- Gnathostomata wikiPageWikiLink Actinopterygii.
- Gnathostomata wikiPageWikiLink Adaptive_immune_system.
- Gnathostomata wikiPageWikiLink Agnatha.
- Gnathostomata wikiPageWikiLink Amniote.
- Gnathostomata wikiPageWikiLink Amphibian.
- Gnathostomata wikiPageWikiLink Amphirhina.
- Gnathostomata wikiPageWikiLink Batoidea.
- Gnathostomata wikiPageWikiLink Bird.
- Gnathostomata wikiPageWikiLink Bone.
- Gnathostomata wikiPageWikiLink Bowfin.
- Gnathostomata wikiPageWikiLink Branchial_arch.
- Gnathostomata wikiPageWikiLink Buccal_pumping.
- Gnathostomata wikiPageWikiLink Cartilage.
- Gnathostomata wikiPageWikiLink Category:Darriwilian_first_appearances.
- Gnathostomata wikiPageWikiLink Category:Extant_Ordovician_first_appearances.
- Gnathostomata wikiPageWikiLink Category:Vertebrate_taxonomy.
- Gnathostomata wikiPageWikiLink Cetacea.
- Gnathostomata wikiPageWikiLink Chimaera.
- Gnathostomata wikiPageWikiLink Chondrichthyes.
- Gnathostomata wikiPageWikiLink Clade.
- Gnathostomata wikiPageWikiLink Clasper.
- Gnathostomata wikiPageWikiLink Class_(biology).
- Gnathostomata wikiPageWikiLink Coccosteus.
- Gnathostomata wikiPageWikiLink Devonian.
- Gnathostomata wikiPageWikiLink Dorsal_fin.
- Gnathostomata wikiPageWikiLink Dunkleosteus.
- Gnathostomata wikiPageWikiLink Elasmobranchii.
- Gnathostomata wikiPageWikiLink Entelognathus.
- Gnathostomata wikiPageWikiLink Epidermis.
- Gnathostomata wikiPageWikiLink Ernst_Haeckel.
- Gnathostomata wikiPageWikiLink Evolution_of_fish.
- Gnathostomata wikiPageWikiLink Extinction.
- Gnathostomata wikiPageWikiLink File:White_shark.jpg.
- Gnathostomata wikiPageWikiLink Fin.
- Gnathostomata wikiPageWikiLink Fish.
- Gnathostomata wikiPageWikiLink Fish_fin.
- Gnathostomata wikiPageWikiLink Fish_jaw.
- Gnathostomata wikiPageWikiLink Fossil.
- Gnathostomata wikiPageWikiLink Gar.
- Gnathostomata wikiPageWikiLink Gill.
- Gnathostomata wikiPageWikiLink Gnathostomata.
- Gnathostomata wikiPageWikiLink Great_white_shark.
- Gnathostomata wikiPageWikiLink Greek_language.
- Gnathostomata wikiPageWikiLink Guiyu_oneiros.
- Gnathostomata wikiPageWikiLink Head.
- Gnathostomata wikiPageWikiLink Holocene.
- Gnathostomata wikiPageWikiLink Holocephali.
- Gnathostomata wikiPageWikiLink Holostei.
- Gnathostomata wikiPageWikiLink Jaw.
- Gnathostomata wikiPageWikiLink Karl_Gegenbaur.
- Gnathostomata wikiPageWikiLink Late_Devonian_extinction.
- Gnathostomata wikiPageWikiLink Mammal.
- Gnathostomata wikiPageWikiLink Myelin.
- Gnathostomata wikiPageWikiLink Neuron.
- Gnathostomata wikiPageWikiLink Nostril.
- Gnathostomata wikiPageWikiLink Ordovician.
- Gnathostomata wikiPageWikiLink Osteichthyes.
- Gnathostomata wikiPageWikiLink Paleontology.
- Gnathostomata wikiPageWikiLink Placodermi.
- Gnathostomata wikiPageWikiLink Psarolepis.
- Gnathostomata wikiPageWikiLink Reptile.
- Gnathostomata wikiPageWikiLink Rose_fish.
- Gnathostomata wikiPageWikiLink Sarcopterygii.
- Gnathostomata wikiPageWikiLink Sauropsida.
- Gnathostomata wikiPageWikiLink Scale_(anatomy).
- Gnathostomata wikiPageWikiLink Semicircular_canal.
- Gnathostomata wikiPageWikiLink Shark.
- Gnathostomata wikiPageWikiLink Silurian.
- Gnathostomata wikiPageWikiLink Skate_(fish).
- Gnathostomata wikiPageWikiLink Skeleton.
- Gnathostomata wikiPageWikiLink Snake.
- Gnathostomata wikiPageWikiLink Spine_(zoology).
- Gnathostomata wikiPageWikiLink Synapsid.
- Gnathostomata wikiPageWikiLink Tadpole.
- Gnathostomata wikiPageWikiLink Taxonomy_(biology).
- Gnathostomata wikiPageWikiLink Teleostomi.
- Gnathostomata wikiPageWikiLink Tetrapod.
- Gnathostomata wikiPageWikiLink Thelodonti.
- Gnathostomata wikiPageWikiLink Thorax.
- Gnathostomata wikiPageWikiLink Transitional_fossil.
- Gnathostomata wikiPageWikiLink V(D)J_recombination.
- Gnathostomata wikiPageWikiLink Vertebrate.
- Gnathostomata wikiPageWikiLink File:Acanthodes_BW.jpg.
- Gnathostomata wikiPageWikiLink File:Blue_runner.jpg.
- Gnathostomata wikiPageWikiLink File:Coccosteus_BW.jpg.
- Gnathostomata wikiPageWikiLink File:Orca-Schädel.jpg.
- Gnathostomata wikiPageWikiLinkText "Gnathostomata".
- Gnathostomata wikiPageWikiLinkText "Gnathostome".
- Gnathostomata wikiPageWikiLinkText "Gnathostomes".
- Gnathostomata wikiPageWikiLinkText "Jawed vertebrates".