In: Science

Submitted By Greed
Words 1220
Pages 5
Vertebrate 2
22. What are the teleostomi and why are they important? Is large group embracing the acanthodians , the bony fishes, and their tetrapod derivatives. Arising within these teleostomes are the teleosts, which today comprise most the living fishes.

32. Why are fishes major players in the vertebrate story? They outnumber all other vertebrates and one of the most successful groups of animals. Within the fish groups jaws and fins first appeared. Ray finned along with fleshy-finned fishes gave rise to land vertebrates, tetrapod's. Tetrapod's inherited paired appendages, jaws, backgrounds, and lungs from fishes.

33. Describe the features of early tetrapod's? First tetrapod's lives mostly in water but could use their formative limbs to navigate the shallow freshwater where they live and perhaps make and occasional sortie onto land. Tetrapod's underwent extensive radiation today's tetrapod's fully terrestrial vertebrates many amphibious, aquatic, and flying groups.

34. Describe labyrinthodonts? sckulls of juveniles carried the lateral line system, but absent in adults of the same species. And metamorphosis living terrestrial amphibians also lose the lateral line system of their aquatic larvae. Thus many ancient tetrapod's, like modern amphibians were probably aquatic as juveniles and terrestrial as adults. Ichthyostega, late Devonian, is a member of the ichtostedid amphibian group. The animal was about 1 cm long. Skelton of seymouria a later terrestrial anthracosaur from the early perimain was about 50 cm long.

35. What are the Lissamphibis including what animals they include common characteristics and where they stand in the vertebrate story? They arose from labyrinthodont radiation. Although many features such as enfolded labyrinthine teeth, have been lost. Three groups of living amphibians arise from within Lissamphibis and date back over 2 million…...

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