Mollusks and Annelids
BIOL 1407
Phylum Mollusca
• Chitons
• Gastropods – snails, slugs
• Bivalves – clams, oysters, scallops
• Cephalopods – chambered nautilus, squid, cuttlefish, octopus
Chitons
Gastropods
Photo Credit for Slug: Dr. Stephen Bostic, 2008
Video: Click on “Mating Leopard Slugs”http://www.bbc.co.uk/sn/tvradio/programmes/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=zC0zOLqYnRg&feature=related
Chambered Nautilus Photo Credit for Octopus: Albert Kok, 2007, Wikimedia Commons
Cephalopods
Photo Credit for Flamboyant Cuttlefish: Jenny Huang, 2006, FlickrPhoto 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=BMOSvz5mThM&NR=1
• Video: http://www.teara.govt.nz/EarthSeaAndSky/SeaLife/Shellfish/2/ENZ-Resources/Standard/2/en
• Photo Credit for Gray Garden Slug Radula, TM400x: 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=2x-8v1mxpR0
• 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=DZig6EL5B6A
• Leech Video from Science Now: – Short Version (podcast):
http://www.youtube.com/watch?v=cKUAroimQrk
– Long Version with graphic surgery: http://www.pbs.org/wgbh/nova/sciencenow/0305/01.html
• (Warning: bloody pictures)
Incomplete vs. CompleteDigestive 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, 8th ed. Pearson Benjamin Cummings.