dbs 402b.2 presidency university, 2016pralay.weebly.com/.../lizards_and_snakes2016.pdf ·...
TRANSCRIPT
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Lizards and snakes
DBS 402B.2Presidency University, 2016
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Amniotes
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Reptilia•
First true terrestrial chordate
•
Limbs ending in claw•
Skin is covered with non-glandular scales
•
Proceolous
vertebrae •
Thecodont
teeth
•
Nucleated, biconvex RBC•
Metanephric
kidneys
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Reptiles •
Class Reptilia
[Dry skin with epidermal scales; skull with one point of articulation with the vertebral column (occipital condyle); respiration via lungs; metanephric
kidneys; internal fertilization; amniotic eggs]–
Order Testudines
or Chelonia
[Teeth absent in adults and replaced by a horny beak; short, broad body; shell consisting of a dorsal carapace and ventral plastron.] Turtles.
–
Order Rhynchocephalia
[Contains very primitive; lizardlike
reptiles; well-developed parietal eye. A single species, Sphenodon
punctatus, survives in New Zealand.] Tuataras.
–
Order Squamata
[Recognized by specific characteristics of the skull and jaws (temporal arch reduced or absent and quadrate movable or secondarily fixed); the most successful and diverse group of living reptiles.] Snakes, lizards, worm lizards.
–
Order Crocodilia
[Elongate, muscular, and laterally compressed; tongue not protrusible; complete ventricular septum.] Crocodiles, alligators, Chorion
caimans, gavials.
Miller Harley
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Squamata•
Skull with superior temporal fossa
•
The maxilla, palatine and pterygoid
are immovable (in lizards but movable in snakes) but quadrate is movable (more in snakes than lizards)
•
Teeth is either acrodont
or pleurodont•
Procoelous
vertebrae
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The skull
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The skull development
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Skull, musculature in jaw movement
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Lizards
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Snakes
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Lizard skull
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Snake skull
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The vertebrae
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The difference
Lizards don’t have them
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Lizard scale
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Snake scales
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Sum up?
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Continued
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Books
Kardong, Miller Harley, Linzey, Rastogy