26.2 Reptiles Reptiles are a diverse group. Reptiles

26.2 Reptiles Reptiles are a diverse group.  Reptiles

26.2 Reptiles Reptiles are a diverse group. Reptiles share several characteristics. ectotherms covered with dry scales reproduce by laying or retaining amniotic eggs three-chambered heart (most) cloaca Evolutionarily, what problem did reptiles have to overcome? 26.2 Reptiles

KEY CONCEPT Reptiles were the first amniotes. 26.2 Reptiles Reptiles have two reproductive strategies. Oviparous reptiles deposit eggs into an external nest. Viviparous reptiles retain eggs and give birth to live offspring. 26.2 Reptiles Reptiles have been evolving for millions of years. Over time, amniotes evolved into three different groups.

synapsids anapsids diapsids 26.2 Reptiles The diversity of ancient reptiles led to the evolution of modern reptiles, birds, and mammals. 26.2 Reptiles There are four modern groups of reptiles.

Turtles and tortoises Lizards, worm lizards and snakes Crocodilians tuatara 26.2 Reptiles There are four modern groups of reptiles. Turtles, tortoises, and terrapins are the remaining anapsids. Unique characteristic: bony shell encases body

200 species 26.2 Reptiles The Turtle Shell Carapace: top

Plastron: bottom 59-61 fused bones connected by bony bridges on the sides and fused to the vertebrate and ribs on the inside So successful an adaptation that everything else evolved around it No running or jumping or flying turtles! Opportunistic eaters

26.2 Reptiles The type of limbs tells a lot about the habitat of a turtle 26.2 Reptiles Snakes and lizards are very closely related and share a number of features. diapsids shed skin at regular intervals flexible skull Jacobsons organ

brain Jacobsons organ tongue 26.2 Reptiles Survival Adaptations

Freezing Losing tail Changing color Threat displays Lizards can run but snakes. 26.2 Reptiles video

26.2 Reptiles Instantly recognizable by outer appearance Large toothy snout Compressed tail Important characteristics are internal! Heart & brain more advanced Crocodilians are more closely related to birds.. diapsids semi-aquatic predators 23 species

26.2 Reptiles Adaptations as an aquatic predator? Eyes, nostrils and ears high on head in same plane 3rd eyelid (nictitating membrane) Nostrils and ears can close when dive Valve at the back of the mouth closes (glottis) for

catching prey w/o drowning Muscular compressed tail Webbed feet Four chambered heart 26.2 Reptiles Crocodilian locomotion

Belly crawl High walk Gallop Swimming Jumping 26.2 Reptiles Alligators versus crocodiles? Alligator Crocodile

Rounded snout (u shaped) Upper teeth overlap and hide bottom teeth Lack modified salivary glands into functional salt glands Pressure sensory organs only around jaws Pointy V shaped snout

Teeth interlock Salt glands for living in brackish and salty water Pressure sensory organs on virtually every scale 26.2 Reptiles Threats to Reptiles (Conservation)

H I P P O Habitat Loss Introduced Species Pollution Population (people)

Overconsumption of resources Dilemma Dont buy wild caught reptiles for pets Dont buy products from reptiles turtle soup, items made from turtle shells, reptile skin boots/belts Appreciating reptiles

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