GUIDED NOTES MARINE REPTILES
· The first vertebrates originated in the ______
· About 350 million years ago, vertebrates came onto land
§ Descended from ______
· ______:
o no more water for support
o developed new ways to move
§ All land vertebrates evolved ______
§ Called tetrapods: “four-footed”(even snakes)
§ Evolved ______
General Characteristics of Class Reptilia
• Dry scaly skin to protect against water loss
• Lay eggs
– Sex is determined by the ______at a time during develop.
• Ectothermic
– ______
– Basking in sunlight to warm and swimming to cool off
• Limited to ______
Adaptations of Reptiles to Land
• Lungs for breathing so cannot obtain oxygen from water
• Amniotic egg-large yolk to______
______
• ______fertilization and eggs laid on land
• ______(more efficient at circulating oxygenated blood)
• ______
• Found above eyes
• Salt excretions help conserve water and wash sand form their eyes
• Concentrated urine to conserve water
Order Crocodilia-______
• ______
• Female lays eggs in a nest and provides limited care for its young for several wks
• Eyes and nostrils are positioned to be above water while croc is submerged
• Well developed senses (but cannot see underwater)
• Opportunistic predators (carnivorous)
– Food is mostly stored as fat and they can go years without a meal
Order Squamata- ______
• All species of sea snake are ______
• 1 to 2 meters in length
• ______
• Some have live birth others must lay eggs on land
• Lungs are highly inflatable and they can dive for 2 hours
Order Squamata- ______
• Amblyrhynchus subcristatus
• Live on the Galapagos Islands southwest of South America
• Dive in cold water ______
– Warm up by basking in sun
– Remove salt w/ salt glands
• Under threat by human introduced animals like cats, dogs and rats and human pollution
Order Chelonia
• Sea turtles are ______
• All 6 species are endangered