Phyla Cnidaria and Ctenophora, Basic Animal Development ...
Phyla Cnidaria and Ctenophora, Basic Animal Development ...
Phyla Cnidaria and Ctenophora, Basic Animal Development ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Phyla</strong> <strong>Cnidaria</strong> <strong>and</strong> <strong>Ctenophora</strong>, <strong>Basic</strong> <strong>Animal</strong> <strong>Development</strong> &<br />
Introduction to Nervous Systems 5.8<br />
Lab #5 - Biological Sciences 102 – <strong>Animal</strong> Biology<br />
Draw <strong>and</strong> CLEARLY label the Obelia sp. medusa from a prepared slide.<br />
Use the internet <strong>and</strong> textbook to assist you in your drawing.<br />
tentacles<br />
radial canals<br />
manubrium<br />
gonads<br />
How many gonads are observed in this species?<br />
Feeding Demonstration in a Hydrozoan<br />
Hydra, a Solitary Hydroid<br />
Phylum <strong>Cnidaria</strong><br />
Class Hydrozoa<br />
Order Hydroida<br />
Suborder Anthomedusae<br />
Genus Hydra, Pelmatohydra, or Chlorohydra<br />
Hydras are found in pools, quiet streams <strong>and</strong> ponds often on the underside of aquatic<br />
vegetation. Your instructor will prepare a slide of hydra for your observation. The hydra may<br />
be contracted at first <strong>and</strong> then extend. Small ciliated protozoans which are symbionts of<br />
hydras are sometimes seen gliding over the body <strong>and</strong> tentacles.<br />
Your instructor will add a drop of Daphnia or similar food to the slide. Some extracellular<br />
digestion occurs within the gastrovascular cavity via enzymes released by gl<strong>and</strong> cells. Food<br />
particles are then engulfed by cells of the gastrodermis <strong>and</strong> digestion is completed<br />
intracellularly. Undigested food is regurgitated as there is no anus.<br />
Observe <strong>and</strong> briefly describe the feeding reaction of the hydra below:
Change language