Wednesday, July 20, 2011

Fish

A fish is any gill-bearing aquatic vertebrate (or craniate) animal that lacks limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJuFV7tbeA4HGE96Jw-t7m3GDZCMjWHOQ_-l6cIbaBFqjkEc8eRZ7J6ehlAoDw-UfAY60qJio_5U8rmW4FMLI2cKp7BP2IEjNgIBJSTsXulrVQ6JBNiR2mKY_S9RVebDUDeAmj7WBySp0/s1600/100316184706_fish_2.jpg

http://www.wallpaperbase.com/wallpapers/animals/fish/fish_4.jpg

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyxqC4gpbaqqerAudby2WgH1VlAddoaQ20n2WEhSI14i5T7FQuUS9-Ip-DpBbdiVEBr-x4STqGPue-Nq01O_M6AxJ1e_g2yp4DjTjX-KH_h9lIpFH0i8HLzVlrvjQetrkUusbt0ekE4kE/s1600/BoarFish009.jpg

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhL3Nl3AphLg0Mn__abh8UG1eTMBBtNBB3O_C4jF31JAQDpAotPcS-m5KvFFHGrJFOxE5LbcBrYZ5HV-Eo5iMy6Kz44pvu_kvKkMprMZ3lF0ZtkCQN7MgWOewkHf0xfo8l_KsyU_8Ug3oY/s1600/fish-with-hands1.jpg

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsAuaW6IXr-prlbPpSVQrEgTa8H8SX5claWwmqC7SodgLhgYz3P8QmxJ7VhKMKjmGjVxOS9vJftLXKpzuQbHT6E67Iln6lHw0NrJtPg3XC8gsSq0EboY2WRAl5I5K4rU5hDrkwd5p8wN4/s1600/red-blue-neon-fish.jpg

http://fighterfish.org/wp-content/uploads/2009/11/Fighter-Fish.jpg

http://fishkipedia.com/wp-content/uploads/2011/02/freshwater-fish.jpg 

Because the term is defined negatively, and excludes the tetrapods (i.e., the amphibians, reptiles, birds and mammals) which descend from within the same ancestry, it is paraphyletic. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.

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