Gnathostomata

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Gnathostomata
Scientific classification
Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata
Classeses
Placodermi Chondrichthyes Acanthodii Osteichthyes

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