ZOO 2090 Lecture Notes - Lecture 11: Pipidae, Shoulder Girdle, Salientia

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Fred Laberge

Document Summary

Discuss different hypotheses about the origin of modern amphibiabs contrast form and function of the three groups of living amphibians. Mucous glands secrete mucus, helps with cutaneous respiration. Granular glands secrete poisonous alkaloid compounds involved in defense skin is thin to allow gas exchange, but the more terrestrial the more keratinized it is, where it protects against desiccation. Only some caecilians and toads have bone elements in the dermis. Padicellate teeth tooth has suture dividing base (pedicel) from tip (crown) Unique to amphibians in modern forms, but also seen in some temnospondyls. Absence of tail (adults) jumpers tympanum usually present fertilization external, except in ascaphus. Skull flattened, open, with big jaws the palate is highly reduced, allowing the eyeballs drop into the oral cavity. Shortened vertebral column with 9 or fewer vertebrae. Atlas-skull junction forms a movable joint through two condyles improved mobility of head in dorsoventral axis.