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Funny mollusk song http://www.youtube.com/watch?v=dEwnar CYIO4&feature=related&safety_mode=tru e&persist_safety_mode=1&safe=active Did You Know? 1. Oyster Consumption Another interesting fact about oysters is that nearly two billion pounds of these mollusks are eaten every year, and Americans eat their fair share. From 1990 to 1995, for example, Americans ate about fifty million pounds of these popular mollusks. 2. Is It a Male or Female Oyster? Just like warm-blooded animals, oysters are either male or female. But, oysters have gonads that generate eggs, as well as sperm. So, oysters have the ability to change their sexes, which they do, at least once. 4/2/12 The Octopus Show What are chromatophores and why do they use them? ___________________ What is the largest species of octopus?______________________________ __ How many species of octopuses are there?_____________________________ Can an octopus regenerate a lost tentacle /arm? _________ What other animals can do this? ____________________ Monday 4/2 Objective: I see one of the most intelligent mollusks in action. Agenda: – Name voting – The Octo. show Homework: None Did You Know In Sweden there is a Christmas tree, also known as a Yule tree which has root system that has been growing for 9,550 years (sometime around the end of the Ice Age). The actual offshoot of the tree is only 600 years old. Tuesday 4/3 Objective: I will know the basic characteristics of a mollusk! Agenda: – Mollusk notes – Mollusk group: if you want me to print tomorrow is when I need to have a digital copy! Homework: Please tell LOLA hi on the way out today Phylum Mollusca Includes: Snails-class Gastropoda Clams-class Bivalvia Octopuses, Squids-class Cephalopoda There are more species of mollusks in the ocean than any other group Soft body protected by a shell of calcium carbonate Very diverse in body structures and habits Mollusk Diversity Biology Much more complex than Cnidarians or Sponges Has a separate mouth and anus (1 way) Has salivary and digestive glands herbivores & carnivores (predators & filter feeders) circulatory system transports nutrients and oxygen Heart pumps blood to all tissues Most have open circulatory system (leaky), cephalopods a closed circulatory system Nervous system simple to complex Most have separate sexes Some species are hermaphrodites External fertilization- bivalves, chitons, & some snails – Sperm & eggs are released into water Internal fertilization-cephalopods & most snails – Cephalopods have modified arm to transfer sperm to female class Gastropoda Snails-”stomach foot” Largest group Approx 90,000 species Mostly marine Body is coiled up inside shell Shell sits on a ventral foot Nudibranch (sea slugno shell) Tulip snail (with shell) Body Structure Mantle thin layer of tissue that produces the shell Foot Head muscular, used in locomotion some are well developed & have eyes Radula Operculum area with small teeth used in scraping algae or other food from surfaces, made of chitin hard plate used to close opening once head/foot retracts into shell Gas exchange is through gills class Bivalvia Oysters (cement themselves to hard surface) Clams (burrow) Mussels (attach to rocks using byssal threads), Body compressed between two shells class Cephalopoda-2 in to 30 ft Cephalopods-most complex brain of all invertebrates – considered intelligent and capable of learning Most cephalopods display color changes correlated to certain behaviors Hectocotylus-Specialized arm transfers a spermatophore (packet of sperm) After eggs hatch female usually dies Blue-ringed Octopus (Hapalochlaena) giant pacific octopus - Octopus dofleini Key Terms for Mollusks Mantle Siphon Radula Veliger Cerata Sepia Operculum Hectocotylus Optional: Give the Find a memory function and device: description of acronym, the listed terms. drawing, rhyme Find terms in etc… Chapter 5 and notes. When finished with the above terms answer questions 1-8 on page 5-43.