PPT-Agnatha
Author : tawny-fly | Published Date : 2017-05-12
a superclass awithout gnathus jaws Jawless fish Only 80 existing species divided into 2 classes Class Cephalaspidomorphi lampreys Most live permanently in
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Agnatha: Transcript
a superclass awithout gnathus jaws Jawless fish Only 80 existing species divided into 2 classes Class Cephalaspidomorphi lampreys Most live permanently in fresh water . (Fishes). Agnatha. , . Chnondrichthyes. , . Osteichtheys. Movement, Shape, Propulsion. Leveling. Feeding and Defense. Class . Agnatha. Includes Hagfish and Lampreys. Agnatha. means lacking a jaw (jawless fish). Class Agnatha, Chondrichthyes, Osteichthyes. (Sharks, Rays, Bony Fish). Agnatha:. Lack a Jaw and Paired fins. Skeleton is Cartilaginous. They have seven or more paired gills. Chondrichthyes. :. They mainly live in marine areas, but some live in freshwater. Dr. . Preetha. . Karnaver. Assistant Professor in Zoology. Christian . College, . Chengannur. . They possess vertebral column- hence the name . vertebrata. Also possess a brain case (Cranium)- hence also known as craniates. '. without jaws') is a superclass of jawless fish in the phylum . Chordata. , subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (. conodonts. and . ostracoderms. ) species. Among recent animals, cyclostomes are sister to all vertebrates with jaws, known as .
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