FLATWORMS, ROUNDWORMS, AND SEGMENTED WORMS Worms (Lexy Bishop, Kellie Black, and Violet Lawson)

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FLATWORMS, ROUNDWORMS, AND SEGMENTED WORMS Worms (Lexy Bishop, Kellie Black, and Violet Lawson)

Flatworms Phylum Name: Platyhelminthes Diversity: 20,000 species

General Characteristics of Flatworms Bilaterally symmetrical Simplest animals- has three tissue layers Move in several ways Nervous system is complex

Body Support or Skeleton/Movement (Flatworms) Uses cilia on its ventral surface to search for food Muscles enable it to twist and turn Has eyes that spot light

Reproduction and Digestion Reproduction Reproduction  Sexual- cross-fertilization  Asexual- fragmentation and regeneration Digestion Digestion  In the gastro vascular cavity  Single opening  Nutrients distributed to cells that line cavity  Finely branched (The gastro vascular cavity)

Examples of Animals in this Phylum Flukes Tapeworms

Roundworms Phylum Name: Nematoda Diversity: 15,000 species

General Characteristics of Roundworms Cyndrical Complete digestive tract Pointed heads Two Openings Tapered Tails

Body Support or Skeleton/Movement Exoskeleton-cuticle Has to be shed Muscles are longitude Causing thrashing movements

Reproduction and Digestion Reproduction:  Sexual: separate males/females  Internal fertilization Digestion:  Specialized regions  Complete digestion tract

Examples of animals in this phylum Hookworms Pinworms Threadworms

Segmented Worms Phylum Name: Annelida Diversity: 15,000 species.

General Characteristics of Segmented Worms Segments similar Distinct head and tail Digested tract is not segmented Has a nerve cord and 2 main blood vessels Closed circulatory system

Body Support or Skeleton/Movement Fluid-filled Two sets of muscles Circular and longitude

Reproduction And Digestion Reproduction  Sexual- the male and female structures are present  Internal fertilization Digestion  Specialized regions  Complete digestion tract

Examples of Animals in this Phylum Sandworms Earthworms Parasitic leaches