BIOL 1102 Lecture Notes - Lecture 29: Ocean Sunfish, Agnatha, Whale Shark
Document Summary
Lizards, snakes, dinosaurs, crocodiles, and birds, two fenestrae: how many vertebrate species are there, about 50,000 species, what were the first vertebrates, fishes, fishes: three main groups. Internal air sac that provides buoyancy in water: three groups of bony fishes: Lungfishes: have lungs for breathing air when water level is low, ray-finned fishes, most numerous and familiar fishes. Legs extend sideways from body, three chambered heart, need water for reproduction: the three main groups (orders) of amphibians, order apoda "no legs" (caecilians) Legless and mostly blind, tropical species burrow in soil: order urodela "tailed" (salamanders, terrestrial and aquatic species, some can regenerate lost body parts, order anura "no tail" (frogs and toads, terrestrial and aquatic species. Many poisonous species: reptiles, what are the four major evolutionary innovations on branch leading to reptiles and mammals, dry, scaly skin prevents dehydration. No more skin breathing: expandable ribcage for efficient breathing, amniotic eggs designed for land.
