Presentation on theme: "Animal Notes III-Mollusks and Review I. Mollusks (Phylum Mollusca) Soft-bodied animals Most are covered by a hard shell (others not) Have a head, foot,"— Presentation transcript:
Mollusks (Phylum Mollusca) Soft-bodied animals Most are covered by a hard shell (others not) Have a head, foot, and a mass of tissue that contains well-developed organ systems Have excretory organs, reproductive organs, and a heart. Can live in salt water, fresh water, or land Most mollusks have an open circulatory system. In this system the heart pumps blood into vessels and the organs are bathed directly in blood.
Mollusks 3 Classes: –Gastropods (includes snails, slugs, and sea slugs) -have one shell or no shell at all -foot is used for movement - many including snails have a large tongue-like organ called a radula. It used to scrape food from plants and rocks –Bivalves (includes clams, oysters, and mussels) -have two part shells -are filter feeders –Cephalopods (includes squids and octopuses) -complex brains and excellent eyesight -have tentacles used for feeding and movement
Warm-UP Be ready to answer the following questions: 1.Sponges are in the phyla __________. –Porifera 2.Sponges have sharp, teeth-like support structures called ____________. –Spicules 3.What two shapes can a Cnidarian be? –Medusa or Polyp