Introduction to Animal Kingdom: Invertebrate Evolution and Classification - Prof. Karen M., Study notes of Botany and Agronomy

Download Introduction to Animal Kingdom: Invertebrate Evolution and Classification - Prof. Karen M. and more Study notes Botany and Agronomy in PDF only on Docsity! April 15, 2011 Chapter 30- Animals: Part I 30.1 Evolutionary Trends Among Animals  Domain Eukarya, kingdom Animalia  Characteristics of animals: o Heterotrophic o Locomotion o Multicellular, high degree of cell specialization o Adult is diploid o Sexual reproduction, with embryo undergoing developmental stages  Type of Symmetry o Asymmetrical  No particular symmetry o Radial Symmetry  Circular organization, can be bisected in any plane to produce mirror images, some sessile o Bilateral Symmetry  Definite right and left halves; only a cut down the midline will produce mirror images, accompanied by cephalic  Level of Organization o Cellular  No true tissues; sponges o Tissue  Have ectoderm and endoderm; cnidarians like hydra o Organ  Have ectoderm, endoderm, and mesoderm; majority of animals  Embryonic Development o Animals with three tissue layers are either:  Protostomes or deuterostomes  Differentiated by three major events: o Cleavage o Fate of blastopore o Coelom formation  Deuterostomes- echinoderms and chordates  Prostomes;  Ecdysozoa: molt their cuticle o Roundworms and arthropods  Trochozoa: have trochophore larvae o Flatworms, annelids, mollusks