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Pima Community College

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Current Classes & Activities
  Bio 100 Biology Concepts
  Bio 105 Environmental Bio
  GLG 140 Intro to Ocean.
  Bio 183 Marine Biology

Fieldtrips and Fieldtrip Classes

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Interesting Links
Marine Life Photo Gallery

Phylum Cnidaria

Cnidarians are radially symmetrical and have a tissue level of organization, allowing them to swim, engulf food, and respond to external stimuli. Cnidarians come in two basics body plans: medusa and polyp. A polyp is a sac-like attached form, and a medusa is a bell-shaped swimming form. Cnidarians have a blind gut, with a mouth surrounded by tentacles. They capture small prey by discharging their nematocysts, unique stinging structures found on the tentacles.

Click on the links below to learn more about different classes of Cnidarians that are found in the intertidal of the Gulf of California. To go back to the Gallery of Marine Life, click here.

To take a practice quiz on the Phylum Cnidaria, click here.


page last updated on 7/15/03

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