Gnathostomata

Gnathostomata

<tr><th bgcolor=pink>Scientific classification <tr><td>

<tr><td>Domain:<td>Eukaryota <tr><td>Kingdom:<td>Animalia <tr><td>Phylum:<td>Chordata <tr><td>Subphylum:<td>Vertebrata <tr><td>Infraphylum:<td>Gnathostomata </table> <tr><th bgcolor=pink>Classes <tr><td> Placodermi
Chondrichthyes
Acanthodii
Osteichthyes
</table> Gnathostomata is the group of vertebrates with jaws. The group is traditionally a superclass, including the familiar classes of fish, birds, and so forth, and a sister group of the jawless vertebrates Agnatha. However, recent genetic studies are causing a reassessment of Gnathostomata as a grouping. Other distinguishing characteristics of living gnathostomates are the myelin sheathes of neurons, and an adaptive immune system. The traditional classes of Gnathostomata include:

Placodermi - extinct
Chondrichthyes (cartilagenous fish)
Acanthodii - extinct
Osteichthyes (bony fish)
- subclass Sarcopterygii (lobe-finned fish)
- subclass Actinopterygii (ray-finned fish)
Amphibia (amphibians)
Reptilia (reptiles)
Aves (birds)
Mammalia (mammals)

External link

Tree of Life discussion of Gnathostomata (http://tolweb.org/tree?group=Gnathostomata&contgroup=Vertebrata)

de:Kieferm�uler es:Gnathostomata eo:Makzelulo he:חולייתנים לסתניים oc:Gnathostomata

Retrieved from "http://www.centipedia.com/articles/Gnathostomata"

This page has been accessed 260 times. This page was last modified 01:11, 25 Nov 2004. All text is available under the terms of the GNU Free Documentation License (see Copyrights for details).