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Honors Biology Module 16. Reptiles April 17, 2014. Our last day of Class. Thursday, May 8, 2014. Quiz 27. Label the parts of the flower. I. Parts of the Flower. Stigma Anther Petal Sepal Ovary Receptacle Ovules Filament Style. Class Reptilia. - PowerPoint PPT Presentation


  • Honors BiologyModule 16ReptilesApril 17, 2014

  • Our last day of Class

    Thursday, May 8, 2014

  • Quiz 27

    Label the parts of the flower

  • I.

  • Parts of the FlowerStigmaAntherPetalSepalOvaryReceptacleOvulesFilamentStyle

  • Class Reptilia

    Turtles, snakes, lizards, alligators and crocodiles. Biologists also put dinosaurs in this class. See figure 16.2, page 498.

  • Members of class Reptilia have several characteristics in common:Covered with tough, dry scalesEctothermicBreathe with lungs throughout their livesThree-chambered heart with a ventricle that is partially dividedProduce amniotic eggs covered with a leathery shell, most oviparous, some ovoviviparous.

  • These characteristics serveTo distinguish reptiles from other creatures in creation, so they are worth discussing.

    Reptiles are covered with scales that are tough, rough, and dry. Are snakes slimy? Many people think so. A snakes skin feels cool, dry and leathery. This is due to its scales to prevent water loss.

  • Many reptiles live where in regions where water is scarce. It is important that they do not lose water through evaporation.

    The scales make sure this does not happen.

  • Reptiles are ectothermicThis means that they have no internal mechanisms to keep themselves warm.

    This is why reptiles like to lie on warm rocks and sun themselves.

  • Scales are not living tissue, so they do not grow with the creature. Like arthropods, reptiles must periodically shed their old skin (molt) in order to continue to grow.

    A reptile always has to have its scales, so new larger set of scales begins growing before the old scales are shed.

  • Reptiles breathe with lungs

    A reptiles lungs are very efficient and have more capacity than the lungs of a similarly sized amphibian.

  • Reptiles have a 3 chambered heartWith a ventricle that is partially divided.

  • Reptiles produce amniotic eggsAminiotic egg is a shelled, water-retaining egg that allows reptiles, bird, and certain mammals embryos to develop on land.

  • Fish and amphibians lay their eggs underwaterThese eggs are jelly like, with only a thin membrane covering them. Thats ok because they are covered in water.

    If Reptile eggs were like that and laid on the ground they would dry out right away. The amniotic fluid prevents the egg from drying out. (see figure 16.1)

  • Reptile ReproductionFertilization occurs inside the female. Once this happens, the developing zygote is encased in a protective shell.

    The shell is a remarkable engineered structure which is just porous enough to exchange gases with the environment but not porous enough for water to evaporate out of the embryo, forming a fluid-filled sac in which the embryo floats.

  • Order Rhynchocephalia: Tuataras

    Page 499

  • Order Suamata: Snakes and LizardsDifferences between Snakes and Lizards:Lizards have two pairs of limbs, snakes none;Lizards have ears and can hear, snakes are deaf;Lizards have the same type of scales all over their bodies, while snakes have specialized scales on their bellies for locomotion.Most lizards have eyelids and can therefore close their eyes. Snakes eyes are always open because they have no eyelids.

  • Order Testudines: Turtles and TortoisesTurtles live in water and Tortoises live on land.

    Most members of this order are distinguished by the large shells that they carry on their backs. Most can pull al of their appendages (legs, neck, and head) into the shell and close off the openings with little trap doors.

  • Marine TurtlesWhile most turtles and tortoises are small, marine turtles like the hawksbill typically reach the weight of 250 pounds.

    The giant tortoise is larger than the hawksbill and can weigh up to 500 pounds.

    The leatherback sea turtle can weigh up to 1,500 pounds.

  • A reptile has no eyelids and is deaf

    Is it a lizard or a snake?

  • Order Crocodilia: Alligators and CrocodilesHow do you tell the difference?

  • Dinosaurs Terrible LizardThe term dinosaur means terrible lizard, so we can conclude that dinosaurs are considered part of the class Reptilia.

    Since we have never seen one, only their fossilized skeleton remains, it is a difficult task to actually classify them.

    Fleshy tissue, organs, scales, hair, etc are rarely, if ever fossilized, so our knowledge of dinosaurs is rather limited.

  • Bill Nye The Science Guy - Reptiles (Full Episode)


  • Reptiles & Amphibians A Documentary Episode 1 Part 1


  • Labs

  • HomeworkFinish Module 15 reading, OYO and Study Guide.Take the Module 15 Test;Next week we will be covering pages 507 518.Complete OYO question 16.1 16.19Study Guide: define a-d; 2-8.Quiz: Difference between Reptiles and Amphibians