#ARE BLUETAIL MOLE SKINS ECOTHERMIC PDF#
#ARE BLUETAIL MOLE SKINS ECOTHERMIC SKIN#

Forelimbs of marine turtles modified into flippers.Water-dwelling turtles have streamline, disk shaped shell to rapidly move in water.Dome shaped shell helps to retract head & limbs in tortoises.Carapace or dorsal surface of shell fused with vertebrae & ribs.

#ARE BLUETAIL MOLE SKINS ECOTHERMIC SKIN#

Body covered with shell composed of hard plates & tough, leathery skin.Feed on insects, worms, & small animals at night.Most active when temperatures are low (nocturnal).Has 3rd eye on top of head (parietal eye) that acts as a thermostat.Live on islands off the coast of New Zealand.Only one living species, Spenodon punctatus, (tuatara lizard).Orders include -– Rhyncocephalia (tuatara lizard), Chelonia (turtles & tortoises), Squamata (lizards & snakes), & Crocodilia (alligators, caimans, and crocodiles).Found worldwide except in coldest ecosystems.Water conserved as nitrogen wastes excreted in dry, paste like form of uric acid crystals.May bask or lie in sun to raise body temperature or seek shade to lower body temperature known as thermoregulation.Ectothermic – body temperature controlled by environment.Partial separation in ventricle to separate oxygenated & deoxygenated blood.Double circulation of blood through heart to increase oxygen to cells.Snakes use scales & well developed muscular & skeletal systems to move.Geckos have toes modified into suction cups to aid climbing.Dry, watertight skin covered by scales made of a protein called keratin to prevent desiccation (water loss).Internal fertilization occurs in female before shell is formed.Chorion lines the inside of the shell & regulates oxygen & carbon dioxide exchange.Allantois stores nitrogenous wastes made by embryo until egg hatches.Yolk sac encloses the yolk or protein-rich food supply for embryo.

Amnion is a thin membrane surrounding a salty fluid in which the embryo “floats”.Has 4 specialized membranes - amnion, yolk sac, allantois, & chorion.Egg had protective membranes & porous shell enclosing the embryo.Amniote (shelled) egg allowed reptiles to live & reproduce on land.Mass extinction of many animal species possibly due to impact of huge asteroid with earth Asteroid Impact Theory.Dinosaurs became extinct at end of Cretaceous period.Herbivores included Brontosaurus & Diplodocus, while Tyrannosaurus were carnivores.Dinosaurs dominated life on land for 160 million years.Thecodonts – small, land reptiles that walked on back legs Ichthyosaurs & plesiosaurs – marine reptiles 3. Cotylosaurs adapted to other environments in Permian period 1.Arose from ancestral reptile group called cotylosaurs (small, lizard like reptile).Reptiles were 1st vertebrates to make a complete transition to life on land (more food & space).

#ARE BLUETAIL MOLE SKINS ECOTHERMIC PDF#

BD Chaurasia Human Anatomy PDF (All volume)

Are bluetail mole skins ecothermic