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Class Reptilia

Class Reptilia. Lecture 19: Animal Classification. Adaptations for life on land Amniotic egg. Water-tight scales. One occipital condyle – one point of attachement of the skull with the vertebral column. Water-conserving kidney. Three-chambered heart Crocodilians have 4

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Class Reptilia

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  1. Class Reptilia Lecture 19: Animal Classification Adaptations for life on land • Amniotic egg. • Water-tight scales. • One occipital condyle – one point of attachement of the skull with the vertebral column. • Water-conserving kidney. • Three-chambered heart • Crocodilians have 4 • Claws for digging and locomotion. • Improved Respiratory System. • Loss of Lateral Line System of fish and amphibians. • 17 orders of reptiles, but only members of 4 remain alive today.

  2. Order Testudines • 300 species of turtles and tortoises • Bony shell • Limbs articulate internally to the ribs • Keratinized beak instead of teeth • Fusion of vertebrae, ribs and skin bones form plates – carapace (top of the shell). • Bones of the pectoral girdle and skin bones form – plastron (bottom of the shell).

  3. Order Crocodylia • 21 living species; crocodiles, alligators, caiman, and gavials. • Anatomically closer to birds and dinosaurs than other reptiles (have 4-chambered heart, triangular eye orbits, other skull characteristics). • Almost unchanged in 170 million years. Brown Caiman Saltwater Croc. American Alligator Gavial or Gharial

  4. Gharial (Gavialisgangeticus) • Teeth and jaws specially adapted to eat fish and crustaceans. • Not a threat to humans. • Less than 200 breeding adults left in the wild. Female Gharial Ghara –bulbous growth of adult males used to blow bubbles and produce sound to attract mates. Male Gharial

  5. Order Squamata • squama, scale + ata, to bear; lizards, snakes, worm lizards • Diverged 150 million years ago from lepidosaurs • Suborder Sauria – Lizards • Suborder Serpentes – Snakes • Suborder Amphisbaenia – Worm Lizards Worm Lizard Coral Snake Chameleon

  6. Suborder Sauria – the Lizards • 4, 500 species of lizards; sauro, lizards • Usually have two pairs of legs • Upper and lower jaws unite anteriorly. • Most are oviparous, some are ovoviviparous or viviparous • Herbivorous, omnivorous, and carnivorous. • Live in a variety of habitats. Blue-tongue Skink Argus Monitor Agama Lizard Frilled Lizard

  7. Suborder Serpentes- The Snakes • About 2,900 species, serpere, to crawl • Most are harmless, but about 300 species are venomous. • Elongate and lack limbs, have more than 200 vertebrae and pairs of ribs – for locomotion. • Upper jaws are movable on the skull and upper and lower jaws loosely joined by flexible ligaments, so each half can move independently – allows swallowing large prey. • All are carnivorous.

  8. Class Aves • Major Characteristics • Adaptations for Flight • Appendages modified as wings • Feathers • Endothermy • High Metabolic Rate • A Vertebral Column modified for flight • Bones lightened by numerous air spaces • Modern Birds: • Possess a horny bill and lack teeth

  9. Order Sphenisciformes – Penguins • Heavy bodied, flightless flipper like wings for swimming, with insulated with fat Emperor Penguins • Order Struthioniformes – Ostriches • Large, flightless birds, wings with numerous fluffy plumes Ostriches

  10. Order Gaviiformes – Loons • Strong straight bill diving adaptations include legs far back on body Common Loons • Oder Procellariiformes – Albatrosses • Large nasal glands, Long and Narrow Wings Wandering Albatross – wing span 11’11”

  11. Order Ciconiiformes – flamingos, storks, herons • Long neck, often folded in flight, long legged waders Chilean Flamingo White Stork Great Blue Heron

  12. Order Anseriforms – Ducks, Geese and Swans • Wide flat bill and an undercoat of dense down; webbed feet. Female Mallard Duck • Order Columbiformes – Pigeons and Doves • Dense Feathers loosely set in skin, well developed crop Decorative Dove

  13. Order Psittaciiforms – Parrots, lories, macaws • Maxilla hinged to skull, thick tongue; reversible fourth toe, usually brightly colored Scarlet Macaw • Order Strigiformes – Owls • Large head with eyes fixed forward; raptorial foot Barn owl.

  14. Major Concept: Mammals 1. Mammalian characteristics evolved gradually over a 200-million-year period in the synapsid lineage.

  15. 2. The skin of mammals is thick and protective and has an insulation covering of hair.

  16. 3. Adaptations of teeth and digestive tract allows mammals to exploit a wide variety of food resources. Siberian Brown Bear - Teeth Beaver Teeth Orca teeth

  17. 4. Efficient systems for circulation and gas exchange support the high metabolic rate associated with mammalian endothermy.

  18. 6. Metanephric kidneys permit mammals to excrete urea without excessive water loss. 5. The brain of mammals has an expanded cerebral cortex that processes information from various sensory structures.

  19. 8. Most mammals are viviparous and have reproductive cycles that help ensure internal fertilization and successful development. 7. Complex behavior patterns enhance mammalian survival.

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