BIOL-3030 Study Guide - Midterm Guide: Viviparity, Stapes, Stratum Corneum
Document Summary
3 major groups: caecilians limbless, salamanders standard walking tetrapod, frogs specialized jumpers. Lissamphibia synapomorphies: smooth glandular skin with numerous glands. Highly permeable to gas and water: mucus glands secrete mucus, helps to keep them moist and prevent water loss. Can also be a defense against predators: poison glands some are more or less toxic, skin shed regularly. Bimodal lifestyle aquatic tadpole larva that goes through a metamorphosis that becomes an adult. Adult usually spends a lot more time on land than tadpole. Direct development tadpole stage stays inside the egg. When the eggs hatch there is a direct frog. Paedomorphosis species that reflect the shape of a child in the adult form. Fossil lissamphibia : each of the 3 have a very long fossil record, preservation of soft tissue. 2: small in size, less than a foot, burrow under ground with their long body & head, skull highly ossified.
