Major Points: - Most metazoans are invertebrates - We're only covering SOME of the phyla of metazoans...of the ones we cover, know: - Major groups within that phylum - Life cycles - Symmetry, tissues, body cavity - What ties them together as a group? - What traits did the common ancestor of metazoans have? - We go a bit deeper into one phylum, Chordata: - What 4 traits make a chordate a chordate? - Evolutionary history and major developmental hallmarks of Chordata - Chordates, Craniates, Vertebrates, Gnathostomes, Tetrapods, Amniotes, Mammals - How do humans fit these traits? - Like ALL other extant clades, true phylogeny of Chordata is made up of mostly extinct species - How did tetrapods transition to land? When? Where? - Birds are totally dinosaurs, yo! - We go further into one group of chordates, the mammals: - What are derived traits of mammals? - Evolutionary trends in mammals - Evolutionary convergence of Monotremes, Marsupials, Eutherians - Hominids vs Hominins - Evolutionary trends of hominins - Interbreeding between humans and other hominins - Hominin expansion from Africa