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Lecture

Reptiles.docx

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Department
Biology
Course
BIOL 2030
Professor
Scott Kelly
Semester
Fall

Description
Reptilia Amniotic Egg Eggs of birds, reptiles, and prototherians (eggy-laying mammals) within which extra- embryonic membranes are formed during embryonic development (filled with amnionic fluid) Amphisbaenids Group of worm-like, burrowing, generally limbless reptiles with inconspicuous eyes and rounded tails Archosauria Subclass of diaspid reptiles, the “ruling reptiles”, that included the dinosaurs, mainly extinct but including the living crocodilians, with specializations of the skeleton showing trend towards bipedalism Crocodylia Order of reptiles found first in the Triassic, typified by the present-day crocodiles and alligators, which are armoured, have front limbs shorter than hind, and a body elongated for swimming Hemorrhagin Poison affecting vasculature, causing blood vessels to break down Ichthyosaurs Group of Mesozoic aquatic reptiles with spindle-shaped body with fins and fin-like limbs Jacobson’s organs A diverticulum of the olfactory organ in many vertebrates, often developing into an epithelium-lined sac opening into the mouth Lacertilia Suborder of reptiles containing the lizards; most species are four-legged, some running on their hind-legs, but some (slow-worms) are legless. They include insectivorous, herbivorous, and carnivorous species, and are adapted to a wide range of habitats, including very dry regions Ornithischians Order of Mesozoic dinosaurs, commonly called the bird-hipped dinosaurs, having a pelvis resembling that of a modern bird. They were all herbivorous and included both bipedal and quadrupedal members Oviparous Egg-laying Ovoviviparous Organisms that produce an egg with a persistent outer covering, but which hatches within the maternal body Parietal Eye Part of the epithalamus present in some animal species, used to sense outside temp Pit Organ Infrared eye, allowing the snake to “see” in the dark and better-focus its attack Pterosaurs An order of Jurassic and Cretaceous archosaurs, flying reptiles commonly called pterodactyls, which have a membranous wing supported by a greatly elongated fourth finger Reptilia Class of amniote, air-breathing, poikilothermic tetrapod vertebrates, mostly terrestrial, having dry horny skin with scales, plats, or scutes, functional lungs throughout life, one occipital condyle and a four-chambered (imperfect) hart. Most reptiles lay eggs with a leartherly shell but some are ovoviviparous. Reptiles include the tortoises and turtles, the tuatara, lizards and snakes, crocodiles, and many extinct forms, such as dinosaurs, pterosaurs Saurischia Large order of Mesozoic archosaurs, commonly called lizard-hipped dinosaurs. They included both bipedal carnivores and very large quadrupedal herbivores Serpentes Suborder of reptiles comprising the snakes Testudines Oder comprising the turtles, having a body/cartilaginous shell Viviparous Giving birth to live young as opposed to laying eggs Reptilian Adaptations  Exclusively terrestrial  Amniotic Egg (Internal Fertilization) o Membranes & Shell  Gas Exchange  Protection  Reduction of water loss  Water conservation strategies o Touch, dry skin o Salt Glands o Nitrogenous waste excretion uric acid (less toxic, less water loss  in terrestrials) vs. Ammonia (more toxic, more water, in aquatics) Morphological Adaptations  Better body support via skeleton (enable standing up)  Jaws adapted for crushing/gripping  Dry, Scaly skin heavy protective armour Systemic Adaptations  3-
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