Funny mollusk song

Funny mollusk song • http://www.youtube.com/watch?v=dEwnarCYIO4&feature=related&safety_mode=true&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.

4/2/12The 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 slug- no shell) Tulip snail (with shell)

Body Structure Mantle Foot Head Radula Operculum • thin layer of tissue that produces the shell • muscular, used in locomotion • some are well developed & have eyes • 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 When finished with the above terms answer questions 1-8 on page 5-43.

Funny mollusk song