Intro to Animal Diversity - Chapter 32 PDF

INTRO TO ANIMAL DIVERSITY Chapter 32 Distinctive Characteristics of Animals  Ingestive heterotrophs  Multicellular  Tissue development  Developmental stages (Hox gene control) Developmental Stages in Animal Embryos Animal Origins Embryonic Germ Layers Geologic History of Animals ...

INTRO TO ANIMAL DIVERSITY Chapter 32 Distinctive Characteristics of Animals  Ingestive heterotrophs  Multicellular  Tissue development  Developmental stages (Hox gene control) Developmental Stages in Animal Embryos Animal Origins Embryonic Germ Layers Geologic History of Animals  Proterozoic Era (pre-Cambrian) 2.5 by bp – 542 my bp  Paleozoic Era 542-251 my bp  Mesozoic Era 251-65.5 my bp  Cenozoic Era 65.5 my bp – present Proterozoic Era 2.5 by – 542 my bp  Eukaryotes arise 2.5 by bp  Common ancestor to multi- cellular organisms 1.5 by bp (based on DNA)  First complex multi-cellular eukaryotes (animals) appear in fossil record 565 my bp (Ediacaran biota) Paleozoic Era 542-251 my bp  Cambrian Explosion 535-525 my bp  Land invertebrates evolve 460 my bp  Land vertebrates evolve 360 my bp Mesozoic Era 251-65.5 my bp  Land animals evolve into new niches  Evolution of wings  Flowering plants evolve in Cretaceous (late Mesozoic) Cenozoic Era 65.5 my bp – present  Mass extinctions just before Cenozoic, large non- flying dinosaurs and marine reptiles lost.  Origin of primates Body Plans - Symmetry (a) Radial symmetry (b) Bilateral symmetry Body Plans - Tissues  Body Plans – Body Cavities (a) Coelomate (b) Pseudocoelomate Coelom Body covering Body covering (from ectoderm) (from ectoderm) Tissue layer Muscle layer Pseudo- (from lining coelom coelom and suspending mesoderm) Digestive tract internal organs Digestive tract (from endoderm) (from mesoderm) (from endoderm) (c) Acoelomate Body covering Key (from ectoderm) Ectoderm Tissue- filled region Mesoderm (from mesoderm) Endoderm Wall of digestive cavity (from endoderm) Protostomes vs. Deuterostomes Phylogeny of Animals