Agnatha

created by ophie

(thing) by ophie (2.1 y) (print)

Wed Apr 26 2000 at 22:45:24

SuperClass Agnatha is a division the subphylum vertebrata which has the following characteristics:

Slender, eel-like body.
Median fins but no paired appendages.
Fibrous and cartilaginous skeleton; notochord throughout life.
Heart with one atrium and one ventricle.
Dorsal nerve cord with differentiated brain.
Digestive systems without stomach.
Sense organs of taste, smell and hearing.
External fertilization.

Agnatha is considered a superclass made up of the following classes:

Class Myxini (the hagfishes)
Class Cephalaspidomorphi (the lampreys)

printable version

Cephalaspidomorphi	Myxini	Vertebrata	Rocksucker
hagfish	What Would Jackie Chan Do?	synapomorphy	Sea lamprey
Lamprey	Rat-tail	On the Border	Osteichthyes
Tetrapod	Devonian

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