Post on 23-Feb-2016
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FLATWORMS, ROUNDWORMS, AND SEGMENTED WORMS
Worms
(Lexy Bishop, Kellie Black, and Violet Lawson)
FlatwormsPhylum Name: Platyhelminthes
Diversity: 20,000 species
General Characteristics of Flatworms
Bilaterally symmetricalSimplest animals- has three tissue layersMove in several waysNervous 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 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)
Examples of Animals in this Phylum
FlukesTapeworms
RoundwormsPhylum Name: NematodaDiversity: 15,000 species
General Characteristics of Roundworms
CyndricalComplete digestive tractPointed headsTwo OpeningsTapered Tails
Body Support or Skeleton/Movement
Exoskeleton-cuticleHas to be shedMuscles are longitudeCausing thrashing movements
Reproduction and DigestionReproduction:
Sexual: separate males/females Internal fertilization
Digestion: Specialized regions Complete digestion tract
Examples of animals in this phylum
HookwormsPinwormsThreadworms
Segmented WormsPhylum Name: AnnelidaDiversity: 15,000 species.
General Characteristics of Segmented Worms
Segments similarDistinct head and tailDigested tract is not segmentedHas a nerve cord and 2 main blood vesselsClosed circulatory system
Body Support or Skeleton/Movement
Fluid-filledTwo sets of musclesCircular and longitude
Reproduction And Digestion
ReproductionSexual- the male and female
structures are present Internal fertilization
DigestionSpecialized regionsComplete digestion tract
Examples of Animals in this Phylum
SandwormsEarthwormsParasitic leaches