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1 Mollusks have ______________ symmetry Bilateral Complete Coelom Mollusks have a ______________ or central gut 2 Some mollusks have a _____________ circulatory system Open Some mollusks have a _______________ circulatory system Closed Mollusks have a more complex _______________ Nervous system than roundworms and flatworms. 3 Chapter 15: Section 2 Mollusks The phylum Mollusca is divided into three classes. They are: Gastropods Slugs and Snails 1. _____________________ Bivalves Clams and Oysters 2._____________________ Cephalopods Squids and octopuses 3._____________________ 4 Draw and lable an example of each type of mollusk Gastropods Bivalves Cephalopods 5 Mollusks have four main parts: Foot Visceral Mass Mantle Shell 6 Ce lv es ph alo va po Bi ds Gastropods 7 8 9 10 What is the different between a closed circulatory system and an open circulatory system? ________________________________________________ Closed Blood is contained in veins and arteries Open Blood is not contained in veins and surrounds organs ________________________________________________ What two features do cephalopods share with humans that other mollusks do not? ____________________________________________ They have a closed circulatory system and ____________________________________________ they have a brain. 11 Annelids Segmented Worms Bilateral • Annelid worms have _____________ symmetry • Annelids have a complex ____________ Coelom Annelid worms also known as ________________________ this is Segmented Worms because their bodies have segments! Segments are: Identical, or almost identical, repeating body parts. ______________________________________________ 12 Annelids have a the most complex ___________ and __________ Circulatory Digestive systems of all the worms! They also have a nervous system that includes nerves in each segment and a _________ in its head. Brain 13 What are the three classes of annelid worms? 1.______________ Earthworms 2.______________ Bristle Worms 3.______________ Leeches Annelids live in/on: 1.____________________ Salt water 2.____________________ Fresh water 3.____________________ Land 14 An earthworm has __________________ 100175 segments on its body. Earthworms use ____________________ to help Stiff Bristles called Setae itself move through soil. 15 Draw and label the parts of an earth worm Anus Anus Setae Segments Mouth Clittelum 16 Platyhelementhes Bilateral Bilateral Nematodes Annelides Bilateral Bilateral Parastitic Parastitic Freeliving Free living Yes simple No Non Open Tapeworms Flukes Planarians Yes Complete No Non Open Open Pinworms Hookworms Heartworms Yescomplex Yes Segmented closed Earthworms Leeches Bristleworms 17 Chapter 15 Section 1 & 2 review: Invertebrates 1. Animals without backbones are called _______________________ 2. Cnidarians have _____________________ symmetry and flatworms have _____________________ symmetry. Bilateral Mantle 3. The shell of a snail is secreted by the ___________________. 4. Annelid worms have ________________ which are identical sections. Segments 5. Invertebrates make up what percentage of all animals? A. 4% B. 50% C. 85% D. 97% 6. Which of the following describes the body plan of a sponge? A. Radial Symmetry B. Asymmetry C. Bilateral Symmetry D. Partial Symmetry 7. Both tapeworms and lechers are. A. Annelid worms B. Flatworms C. Parasites D. Predators 8. You have discovered a strange new animal that has bilateral symmetry, a coelom, and nerves. Will this animal be classified in the Cnidaria phylum? Why or why not? _______________________________________________________ No. Cnidarians have radial symmetry 9. Unlike other mollusks, cephalopods can move rapidly. Based on what you know about the body parts of mollusks, why do you think cephalopods have this ability? ______________________________________________ They have more than one foot. Radial 10. Roundworms, flatworms, and annelid worms belong to different phyla. Why aren’t all worms grouped in the same phylum? ____________________________________________ Because they all digest food differently 18
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