LAB__8_-_Animal_Diversity - INVERTEBRATES Animals without a...

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INVERTEBRATES Animals without a spinal column (97% of all animal species; ~ 34 phyla) Porifera — sponges Cnidaria — jellyfish, corals, hydras & sea anemones Platyhelminthes — flatworms Nematoda — roundworms Annelida — earthworms, leeches (segmented worms) Mollusca — snails, clams, squids and octopuses Arthropoda — insects, crustaceans, arachnids, centipedes, millipedes Echinodermata — sea stars, sea urchins, sea cucumbers
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Protostomes Deuterostomes Spiral cleavage Radial cleavage Early determination of cells Indeterminant for longer time Blastopore becomes the mouth Blastopore becomes the anus Coelom schizocoelous Coelom enterocoelous Trochophore larva Dipleurula larva Phyla include: Annelida, Mollusca, Arthropoda Phyla include: Echinodermata and Chordata
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3 germ layers Animals with radial symmetry produce two layers called ECTODERM and ENDODERM, making them DIPLOBLASTIC .
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  • Fall '06
  • 11:00-01:50pm
  • Evolution, Cnidaria, Body cavity, Annelid, sea anemones Platyhelminthes

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