01:460:206 Lecture Notes - Lecture 3: Lungfish, Anapsid, Lissamphibia
18 Sep 2016
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Recap: serious problems we solved in order to exist in hostile environment dehydration, temperature and gravity. Development: many with metamorphosis (larval form) Eggs: no shell, gelatinous (like a fish egg) Ovoviviparous produces eggs but keep them inside (some snakes) Development: direct only (what hatches is what adult will be) Skin: scales, few glands (to prevent water loss) Eggs: shell (strategy to protect embryo) Embryonic membranes: present ( = amnion) protect embryo. Reproduction: oviparous to ovoviviparous to viviparous. ^ to prevent dehydration developed: scales, eggs, embryonic membranes, internal fertilization, lungs only and many types of reproduction. In fossil record how to tell the difference with so many soft tissue traits. Amphibian: lateral-line system: present in ancestral forms, vertebrae: pc is less than or equal to ic (pc < ic) Reptile: lateral-line system: absent, vertebrae: pc is more than or equal to ic (pc > ic) There"s a small hole in skull naris (es) aka nostril.
