Class Reptilia Testudines Squamata Crocodilia Sphenodontia

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1 Class Reptilia Testudines (around 300 species Tortoises and Turtles) Squamata (around 7,900 species Snakes, Lizards and amphisbaenids) Crocodilia (around 23 species Alligators, Crocodiles, Caimans and Gharials) Sphenodontia (2 species of Tuataras)

2 Class Reptilia

3 Characteristics of Reptiles A variety of body shapes that are covered with scales and plates for protection against desiccation and injury. Most have paired limbs with five toes except snakes. Skeleton is well ossified and well developed. Respiration with lungs, reptiles do not have gills like the larval stage of amphibians.

4 Characteristics of Reptiles 3 chambered heart, a four chambered heart in crocodilians Efficient water conservation organs and behaviors. An example of welldeveloped organs include paired kidneys and salt glands. Sexes separate with internal fertilization. They can give live birth or lay eggs. Reptile eggs have a harder shell that can be buried on land and it won t dry out, similar to the egg of a bird. All reptiles are ectothermic.

5 Testudines Turtles and Tortoises Turtles evolved longs before there were mammals, birds, lizards or snakes, over 200 million years ago.

6 Characteristics of Testudines Turtles Their unique shell appeared very early. The top is called the carapace and the bottom is the plastron. The dorsal bony carapace (shell) is to protect the species from potential predators but it also helps the turtle buffer tough environmental conditions and Tortoises

7 The shell of turtles and tortoises Modifications to the shell over evolutionary time: Making the shell lighter in large land tortoises and water turtles Hinges for closing up tight in some species The protection of the shell protection results in: The great longevity over ecological time of the order of turtles and tortoises The fact that turtles/tortoises are such long-lived individuals

8 Characteristics of the shell in turtles and tortoises Modifications to the shell over evolutionary time: Making the shell lighter in large land tortoises and water turtles Hinges for closing up tight in some species The protection of the shell protection results in: The great longevity over ecological time of the order of turtles and tortoises The fact that turtles/tortoises are such long-lived individuals

9 Characteristics of Testudines Lacking teeth, a pronounced keratinmade beak is adapted to tear and hold food. Testudines have a varied diet Omnivorous.box turtle Herbivorous many tortoise species Carnivorous many aquatic species

10 Characteristics of Testudines Limbs are modified to suit the habitat and behavior of species. Aquatic animals have flattened paddle-like feet for swimming. Land dwelling animals often have elephantine feet for walking on substrate.

11 Squamata. Snakes and Lizards The order of snakes and lizards is the largest of the reptiles. The differences between snakes and lizards Snakes No legs No external ears No eyelids Lizards Usually have legs, but not all Have external ears Have eyelids

12 Sensory Perception in snakes and lizards Flicking their forked tongue collects chemical molecules that are brought into the mouth and are inserted into the Jacobson s organ on the roof of the mouth. This organ analyzes the chemical signals

13 Serpentine body plan, the unique morphology of snakes Lengthened by extra vertebrate Internal organs are modified to allow for such a narrow body plan Rapid locomotion with three types of crawling, rectilinear, undulation or side winding

14 Sensory Perception in Snakes While snakes do not have external ears, they due have a single earbone allowing them to hear low-frequency sound very well. Some diurnal snakes such as black racers track prey by keen eyesight Some snakes such as pit vipers and most boas and pythons have pits on the side of their face to detect infrared heat rays.

15 Squamata the Lizards Versatile tongue for sensory perception with Jacobson s organ, for catching food or as a warning to would be predators Locomotion usually on land with developed legs. Lizards can also climb well and many species are arboreal or tree dwelling. Defense through speed, tail shedding, intimidation and/or camouflage. Tail can be voluntarily shed to escape attack. Can regenerate but at a cost in energy, fat storage and even reproduction

16 Squamata the Lizards Lizards have radiated into a wide variety of habitats and display an array of behavioral, morphological and physiological adaptations. o o o o o Keen eyesight (diurnal activity) Water conserving organs (can inhabit deserts) Most with legs, some without Several venomous species Behavioral thermoregulation

17 Crocodilia Crocodiles, Alligators and Complete separation of arterial and venous blood True cerebral cortex Third eyelid as in birds Position of nostrils and ears that close when submerged Relatives

18 Crocodilia Crocodiles, Alligators and Relatives Large compressed tail for swimming Modified appendages Complex behaviors such as parental care and communication

19 What is the difference between alligators and crocodiles? Coloration Blackish/grey Snout Wider U-shaped snout Aggressiveness Less aggressive Preferred Water Freshwater Lingual Salt Glands Non-functioning Habitat Southern U.S. and China Length of adult 4.3 meters Nesting Lay eggs in mounds of vegetation surrounding freshwater Location of dermal pressure receptors Limited to jaws Teeth of the lower jaw Hidden(cannot be seen when jaw is closed) Lifespan years

20 What is the difference between alligators and crocodiles? American Saltwater Crocodile Coloration Olive green/brown Snout Longer V-shaped snout Aggressiveness More aggressive Preferred Water Brackish/Saltwater Lingual Salt Glands Functioning Length of adult 5.8 meters Habitat Brackish or Saltwater Range: Africa, Australia, and America Nesting Lay their eggs in mud or sand Location of dermal pressure receptors Over most of the body Teeth and lower jaw Visible (teeth of lower jaw can be seen when jaw is closed) Lifespan years

21 Sphenodontia Tuataras The tuatara is a living fossil, having many primitive features similar to fossils over 200 million years old! Some of these features are: A primitive skull A third eye or parietal eye which is on the top of the skull, complete with lens, cornea and nerves to the brain. These animals are only found on a handful of islands north of New Zealand.

22 third eye or parietal eye. This eye is positioned on the top of the skull, complete with lens, cornea and nerves to the brain.

23 Questions???

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