BIOL211 Lecture Notes - Lecture 11: Oviparity, Hellbender, Parotid Gland
6 Dec 2014
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Document Summary
Extant amphibians fall into three lineages: anurans , urodeles , gymnophionans . Can move in a number of ways jumping, swimming, walking. Salamanders employ walk-trot locomotion: amphibian characteristics. Tails present in salamanders but absent in frogs (anura without a tail) Moist, permeable skin contain mucus glands to keep skin moist. All are carnivores eat anything they can catch & swallow. Also have two bones to transmit sound in the inner ear . Frogs and salamanders have a special retinal cell . The teeth are composed of a dentin-based crown and base (pedicel) that is separated . Outward bulge of the eye due to the levator bulbi muscle. Salamanders and caecilians swim by passing along a sine wave down the body. Anurans thrust the hind legs due to inflexible body: salamanders, introduction. Elongated body shape with four functional limbs least specialized of all amphibians. Many species found in northern hemisphere: characteristics.
