Animal Classification: Exploring Kingdom Animalia & Simplest Animals, Lecture notes of Biology

Download Animal Classification: Exploring Kingdom Animalia & Simplest Animals and more Lecture notes Biology in PDF only on Docsity! Kingdoms of Life Outcome Describe criteria used for the classification of animals. Kingdom Animalia • Multicellular  division of labour • Heterotrophic; with body cavity • Several feeding habits • Reproduction mainly sexual • Classified according to: body plan; symmetry; germ layers; body cavity; segmentation Sac versus tube-within-a-tube body plan Asymmetrical Radial Bilateral Symmetry Asymmetrical Radial Bilateral Functions of the Coelom • Location and protection of internal organs • Allows internal organs and body wall to move independently • Aids transport of nutrients and wastes • Acts as a hydrostatic skeleton Segmentation Gut (endoderm) Pseudocoel Muscle meee ( Internal a ee Ectoderm — Gut (endoderm Pseudocoelomate * Internal organ Peritonium (mesoderm) Coelom Muscle een Ectoderm Coelomate The Invertebrates • Do not have a backbone and constitute 99% of all animals • Increase in order of complexity – from simple (primitive) to complex (advanced) forms. Phylum Porifera (Sponges) Marine; vase-shaped (sessile) with a central cavity  spongocoel surrounded by the body wall pinacoderm. Phylum Porifera (Sponges) Simplest animals Cellular level of organization. Skeleton of spicules and spongin fibers. Body organized around a water canal system Osculum Collar Food particles in mucus & oy val Flagellum Phagocytosis Choanocyte sarieies Amoebocyte Amoebocyte — Epidermis © 1998 Addison Wesley Longman, lnc. BUDDING > A sponge colony Dead-end phylum Present Day Phyla Porifera E> eS Mollusca Arthropoda Chordata casa Ww ... F Sp = @* a Annelida Echinodermata Coclom Bilateral symmetry True Tissue Ancestral Protists Phylogenetic Tree of KINGDOM ANIMALIA Announcements • Test 01: Monday 02 April 2018?? (Page 1 to Page 48) • Office etiquette • Class Reps (contact numbers) • Extra class: Monday 26/03/2018 @ 17H30