Gnathostomata

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Gnathostomata
\n\n\n\n\n\n\n : Eukaryota : Animalia : Chordata : Vertebrata Infraphylum: Gnathostomata \n
Classeses
\nPlacodermi \nChondrichthyes \nAcanthodii \nOsteichthyes \n

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

External link

• Tree of Life discussion of Gnathostomata

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