BIOL 150 Lecture Notes - Lecture 1: Chordate, Devonian, Gastrointestinal Tract
Document Summary
Deuterostomes: largest, most morphologically complex animals (complex bodies, not most species-rich, less abundant, coelomate, internal skeleton, segmentation less obvious. All of the advanced body plan features: tunicates (weird looking-mot primitive, lancelets (more primitive, vertebrates: 4 morphological features: experienced at some point in life but no always entire life. Vertebrates contain all of the following: vertebrae of cartilage or bone (protects spinal cord, more mobile, cranium (skull; protects *brain, heart with advanced circulation, adaptations for active movement. Jaws and teeth (from gills) and endoskeleton (caused massive radiation) Tetrapods (four-limbed organisms) on land: evolved from lobe- nned shes in swampy coastlines of devonian (365 mya, limbs with five digits; the only ones to survive, some moved onto land and then returned to water (whales, dolphins, some snakes) Tetrapod advancements: limbs for land, amnioac egg (shell, scales, feathers / ight, more ef cient heart / circulation, mammary glands, dentition, placenta.
