Biodiversity- Mollusks

Biodiversity- Mollusks

Biodiversity- Mollusks Sarah Whitebloom Matt Jones Eddie Frere Objective: SWBAT describe what a mollusk is, the different types of mollusks, examples, and their functions Warm-Up An invertebrate with What is a mollusk? What are the 3 types of mollusks?

a soft, unsegmented body often enclosed in a hard shell containing calcium carbonate Gastropoda, Bivalvia, Cephalopoda Notes- Mollusks Mollusk- an invertebrate with a soft, unsegmented body often enclosed in a hard

shell containing calcium carbonate The body is divided into 4parts: foot, visceral mass, mantle, and shell The 4 types Foot: it has different forms for different circumstances; flat structures for crawling, spade-shaped structures for burrowing, and

tentacles for capturing prey Visceral mass: below the mantle; consists of the internal organs Mantle: thin layer of tissue that covers most of the body Shell: made by glands in the mantle

that secrete calcium carbonate(not found on all slugs and other mollusk groups) The Body Feeding Can be herbivores, carnivores, filter feeders, detritivores, or parasites Snails and slugs get their

food using a flexible, tongueshaped structure called the radula There are hundreds of tiny teeth attached to the radula Herbivores use it to scrape the algae off the rocks Carnivores use it to drill through shells of other animals Food is carried by water

which enters through a siphon: a tube-like structure where water enters and leaves the body Circulation The oxygen and nutrients are carried through the mollusk body by a circulatory system It is either open or closed Open circulatory system: blood is pumped through vessels by a heart Open circulatory systems work best for slow-moving mollusks because the demand for oxygen is lower

Closed circulatory system: transport blood through an animals body much more quickly than an open circulatory system; better for faster- moving mollusks Gastropods Shell-less or single- shelled mollusks that move by using a muscular foot located on the ventral side Includes pond snails,

land slugs, sea butterflies, sea hares, limpets, and nudibranchs Bivalves Two shells that are held together by one or two powerful muscles Includes clams, oysters, mussels, and scallops

Cephalopods Soft-bodied mollusks in which the head is attached to a single foot The foot is divided into tentacles or arms Most active mollusks Octopi, squids, cuttlefishes, and nautiluses

Activity Activity round 1 Mollusk Cephalopod Gastropod Bivalve Radula Open-circulatory system Closed-circulatory

system Foot Visceral mass Mantle Activity round 2 Good for slow moving mollusks Octopi Move with a muscular Food is carried by

water and enters through the Oxygen and nutrients foot carried through the Tiny teeth attached to body by a the Blood pumped through ____ drill through shells of other animals vessels by a heart ____ scrape algae off rocks

Activity round 3 Shell Soft-bodied mollusks Most active mollusks Clams Shell-less/singleshelled Sea butterflies Siphon Below the mantle

Thin layer of tissue Not found on slugs Wrap-Up 1. What is a mollusk? 2. What are the 3 groups? 3. What are the 4 parts in the body plan?

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