BIO 360 Quiz: Marine Tetrapods: Reptiles, Birds, & Mammals -- Exam 2
29 May 2017
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Two girdles: pectoral and pelvic with 4 (tetra) limbs. Air-breathing tetrapods that have returned to a sometimes full-time life in the sea. All are hypoosmotic to seawater (body uid is dilute compared to seawater same as bony shes) Two groups are endothermic (warm bodied) birds and mammals. Reptiles: characteristics, success of marine reptiles, survey of marine reptiles, crocodiles, turtles, galapagos marine iguana, sea snakes, characteristics of marine reptiles. Numbers: about 60 species of sea snakes, 7 species of sea turtles, 1 marine lizard (iguana, 1 marine crocodile, a number of estuarine reptiles. Success partly due to: amniotic egg, advanced circulatory system, osmoregulation. Reptile ancestors rst appeared ~ 100 mya: success of marine reptiles. Amniotic egg: evolved about 340 million years ago, protective shell over egg, liquid lled sac (amnion, yolk supply of food, advantages - less vulnerable to predation and higher survival: Development within egg no need for vulnerable larval stage.
