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Reptiles 31-1

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Katelynn Dorn

on 26 September 2018

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Transcript of Reptiles 31-1

Reptiles 31-1
Reptile Body Systems (cont.)
legs- shovel-snouted lizard hops
adder- digs its scales into sand and contracts/relaxes muscles to create waves
flippers- turtles
internal fertilization
many lay eggs in nests, then abandon them
amniotic egg- water-proof but porous
amnion, yolk sac, allantois, chorion, shell
Groups of Reptiles (cont.)
3. Turtles (aquatic) and Tortoises (terrestrial)- Testudines
shell- carapace (dorsal), plastron (ventral)
no teeth- sharp ridges, powerful jaws
4. Tuataras- Sphenodonta
found on islands by New Zealand
like lizards but have not external ears, sense the level of sunlight, and have a third eye
Reptile Body Systems (cont.)
urine produced in kidneys
aqauatic reptiles excrete urine as ammonia
terrestrial reptiles excrete it as uric acid
sensory organs on roof of mouth to detect chemicals
simple ears- external ear drum and ear bone
snakes can pick up vibrations through their skull bones, Jacobson's organ
pit vipers- have heat sensitive pits about mouth
Reptile Body Systems (cont.)
respiration- spongy lungs
snakes have one lung
crocodiles have flaps of skin that separate mouth from nasal passages
circulation- double loop
partial septum- wall that separates oxygen-rich and oxygen-poor blood
Groups of Reptiles
1. Lizards and Snakes- Squamata
Lizards- scales, clawed toes, legs, external ears, movable eyelids
Snakes- some are venomous (top 10)
2. Crocodillians- Crocodilia
alligators, crocodiles, caimans, gavials
prey on fish, deer, humans
may live in either fresh or salt water, care for their young
Reptile Body Systems
Ectotherms-rely on behavior to help control body temperatures
herbivores- iguanas: have long digestive systems to break down plant material
carnivores- snakes, crocodiles, alligators, chameleons
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