Download - 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)
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Flatworms
Phylum Name: Platyhelminthes
Diversity: 20,000 species
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General Characteristics of Flatworms
Bilaterally symmetricalSimplest animals- has three tissue layersMove in several waysNervous system is complex
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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
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Reproduction and Digestion
Reproduction Sexual- cross-fertilization Asexual- fragmentation and regeneration
Digestion In the gastro vascular cavity Single opening Nutrients distributed to cells that line cavity Finely branched (The gastro vascular cavity)
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Examples of Animals in this Phylum
FlukesTapeworms
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Roundworms
Phylum Name: NematodaDiversity: 15,000 species
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General Characteristics of Roundworms
CyndricalComplete digestive tractPointed headsTwo OpeningsTapered Tails
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Body Support or Skeleton/Movement
Exoskeleton-cuticleHas to be shedMuscles are longitudeCausing thrashing movements
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Reproduction and Digestion
Reproduction: Sexual: separate males/females Internal fertilization
Digestion: Specialized regions Complete digestion tract
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Examples of animals in this phylum
HookwormsPinwormsThreadworms
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Segmented Worms
Phylum Name: AnnelidaDiversity: 15,000 species.
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General Characteristics of Segmented Worms
Segments similarDistinct head and tailDigested tract is not segmentedHas a nerve cord and 2 main blood vesselsClosed circulatory system
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Body Support or Skeleton/Movement
Fluid-filledTwo sets of musclesCircular and longitude
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Reproduction And Digestion
ReproductionSexual- the male and female
structures are present Internal fertilization
DigestionSpecialized regionsComplete digestion tract
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Examples of Animals in this Phylum
SandwormsEarthwormsParasitic leaches