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About Fish |
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by Chabala Chisenga | 15-10-2018 15:42
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Fish are gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming theolfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous andbony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are renderedparaphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammalswhich all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered atypological, but not a phylogeneticclassification.
Source Wikipedia. Thank you for reading.
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3 Comments
thank you.
Posted 21-11-2018 03:08
Fishes are the important part of our quatic ecosystem but due to water pollution serious impacts have been caused to them.
Posted 19-10-2018 22:18
Hello Chabala,
Thanks for informing us about FISH.
Posted 15-10-2018 18:48