Bio Lab Wksht & HW Questions 35

Bio Lab Wksht & HW Questions 35 - exoskeletons...

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30 Class Scyphozoa (jellyfishes) Scyphozoans show a dominant medusa and a reduced or absent polyp. Scyphozoan medusae show a massive development of mesoglea and, unlike hydrozoan medusae, most lack a velum. Sketch the Aurelia on display. Note the 4-part radial symmetry - 4 oral arms, 4 gonads and 4 radial canals (not easily visble) branching off the gastrovascular cavity. Class Anthozoa (corals and anemones) Members of this class occur in a variety of types, but two main groups predominate: the large, solitary anemones are fleshy and lack any calcareous exoskeleton; the corals (comprised of enormous colonies of minute coral animals, which secrete calcareous exoskeletons ) and, in warm, clear, tropical waters, can form reefs. The corals displayed are the
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Unformatted text preview: exoskeletons only. Observe the specimen in the marine tank. Can you see the tentacles and mouth? Make a sketch of discharged nematocysts available on demonstration under oil immersion. Phylum Ctenophora (comb jellies) These exclusively marine animals are planktonic, swimming by means of 8 rows of fused ciliated comb plates , and feeding with retractable tentacles containing adhesive mucous-secreting cells. If you cant find the tentacles in the preserved specimens, they have probably been retracted. Ctenophores are radial and diploblastic. Name two characteristics that members of the Phylum Cnidaria and the Phylum Ctenophora have in common. Name two diagnostic characteristics that can be used to distinguish between members of these phyla....
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