Mollusks and Annelids BIOL 1407 Phylum Mollusca Chitons

Mollusks and Annelids BIOL 1407

Phylum Mollusca • • Chitons Gastropods – snails, slugs Bivalves – clams, oysters, scallops Cephalopods – chambered nautilus, squid, cuttlefish, octopus

Chitons

Gastropods Video: Click on “Mating Leopard Slugs” Photo Credit for Slug: Dr. Stephen Bostic, 2008 http: //www. bbc. co. uk/sn/tvradio/programme s/lifeintheundergrowth/video. shtml

Gastropods Photo Credit for Florida Fighting Conch: LA Dawson, 2006, Wikimedia Commons

Bivalves Photo Credit for Giant Clam: Jan Derk, 2002, Wikimedia Commons

Cephalopods Video with Octopus and Cuttlefish: Start at 1: 20 minutes http: //www. youtube. com/watch? v=z. C 0 z. OLq. Yn. Rg&feature=related Chambered Nautilus Photo Credit for Octopus: Albert Kok, 2007, Wikimedia Commons

Cephalopods Photo Credit for Flamboyant Cuttlefish: Jenny Huang, 2006, Flickr Photo Credit for Caribbean Reef Squids: Clark Anderson, 2006, Wikimedia Commons

Characteristics of Mollusks • • Bilateral symmetry Triploblastic Coelomate Trochophore larva • Photo Credit for Lined Chiton: Kirt L. Onthank, 2007, Wikimedia Commons

Characteristics of Mollusks • Shells (exoskeleton) • Mantle • Visceral Mass • Foot • Photo Credit for Common Snail: Macrophile, 2005, Wikimedia Commons

Characteristics of Mollusks • Radula (many) • Video: http: //www. youtube. com/watch? v=B MOSvz 5 m. Th. M&NR=1 • Video: http: //www. teara. govt. nz/Earth. Sea. A nd. Sky/Sea. Life/Shellfish/2/ENZResources/Standard/2/en • Photo Credit for Gray Garden Slug Radula, TM 400 x: Michal Maňas, 2005, Wikimedia Commons

Characteristics of Mollusks • Complete Digestive System • Circulatory System: open or closed • Gills • Centralized nervous system • Photo Credit for Nudibranch: Jans Petersen, 2006, Wikimedia Commons

Intelligence • Cephalopods – Complex Brains – Excellent Vision – Nervous System controls Chromatophores – Video, Kings of Camouflage: • http: //www. youtube. com/watch? v=2 x-8 v 1 mxp. R 0 Photo Credit: Nick Hobgood, 2006, Wikimedia Commons

Centralized Nervous System

Phylum Annelida • • Segmented Worms Oligochaetes – earthworms & relatives Polychaetes Leeches

Oligochaetes Photo Credit of earthworm : Michael Linnenbach, 2005, Wikimedia Commons

Polychaetes Photo Credit of Christmas Tree Worms : Nick Hobgood, 2005, Wikimedia Commons

Leeches

Characteristics of Annelids • Bilateral Symmetry • Triploblastic • Coelomate • Segmented • Trochophore larvae • Photo Credit of Tomopteris: Courtesy of uwe kils, 2005, Wikimedia Commons

Annelid Videos • Giant Earthworm Video: http: //www. youtube. com/watch? v=DZig 6 EL 5 B 6 A • Leech Video from Science Now: – Short Version (podcast): http: //www. youtube. com/watch? v=c. KUAroim. Qrk – Long Version with graphic surgery: http: //www. pbs. org/wgbh/nova/sciencenow/0305/01. html • (Warning: bloody pictures)

Incomplete vs. Complete Digestive Systems

Animal Nutrition • Macronutrients: – Carbohydrates – Lipids – Proteins • Essential Nutrients – – Essential Amino Acids Essential Fatty Acids Vitamins Minerals

Transport • Closed Circulatory System • Hearts = Pumps • Blood Vessels = Pipes – Arteries – Capillaries – Veins • Blood = Fluid • Photo Credit: Dr. Stephen Bostic, 2008

Gas Exchange • Gills or Skin Surface • Respiratory Pigments – Hemoglobin; Dissolved in blood (most common) – Chlorocruorin (some polychaetes) – Hemerythrin (some polychaetes) – Photo Credit for Terebellid Polychaete: Matthias Buschmann, 2007, Wikimedia Commons

Excretory System: Metanephridia

Centralized Nervous System

The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8 th ed. Pearson Benjamin Cummings.