CK12 Life Science

Flatworms Worms in the phylumPlatyhelminthesare called flatworms because they have flattened bodies. Some species of flatworms a ...

Figure 11.12: Marine flatworms can be brightly colored. ( 2 ) Figure 11.13: Tapeworms are parasitic flatworms that live in the i ...

Figure 11.14: Tapeworms attach to the intestinal wall with a head region that has hooks and suckers. ( 12 ) organs. A roundworm’ ...

Figure 11.15: Nematodes can be parasites of plants and animals. ( 10 ) Figure 11.16: One roundworm parasite causes elephantiasis ...

Figure 11.17: Earthworms are segmented worms. ( 5 ) Figure 11.18: Leeches are parasitic segmented worms. ( 16 ) ...

and intestines. The circulatory system consists of paired hearts and blood vessels, while the nervous system consists of the bra ...

http://animaldiversity.ummz.umich.edu/site/accounts/information/Platyhelminthes. html http://www.ucmp.berkeley.edu/platyhelmint ...

Lab Survey of Some Invertebrates In this lab you will observe some examples of the invertebrates, those animals that do not have ...

Image Sources (1) prep4md.http://www.flickr.com/photos/27920559@N05/2778292954/. CC-BY 2.0. (2) Steve Childs. Marine flatworms c ...

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Chapter 12 Other Invertebrates 12.1 Lesson 12.1: Mollusks Lesson Objectives Discuss what characteristics define mollusks. Descr ...

Figure 12.1: The beach yields a wide variety of mollusks. ( 13 ) Figure 12.2: Pearls being removed from oysters. ( 16 ) ...

Figure 12.3: The inside of a bivalve, one of the mollusk classes described in “Types of Mollusks,” showing mother of pearl. ( 35 ...

What are Mollusks? Mollusks belong to the phylumMollusca. The mollusk body is often divided into a head with eyes or tentacles, ...

Types of Mollusks WithinthephylumMollusca,thereareapproximately160,000livingspeciesandanestimated 70,000 extinct species. Mollus ...

Table 12.1: (continued) Molluscan Class Number of Species Habitat Features of Class/Examples Bivalvia 8,000 Marine (some clams l ...

Figure 12.7: An example of a gastropod species, the ostrich foot. ( 10 ) Figure 12.8: A Caribbean reef squid, an example of a ce ...

Importance of Mollusks Mollusks are important in a variety of ways, including as food, for decoration, in jewelry, and in scient ...

Lesson Summary The mollusk body often has a head with eyes or tentacles, a muscular foot, a mass housing the organs, and a mant ...

nacre The iridescent inner shell layer produced by some bivalves, some gastropods, and some cephalopods; also known as mother of ...