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Invertebrates: Cnidarians

Cnidarians are invertebrates with a radially symmetrical body and saclike internal cavity.

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Man o' war jellyfish. Credit: NOAA Fisheries/Peter Duley. <a href='invertebrates/cnidarians/man-o-war-peter-duley.jpg'> Download largest ▼ Stalked medusa, <em>Haliclystus californiensis</em>, is 2 centimeters (3/4 inch) in length. The specimen was collected off the coast of California. Credit: NOAA Fisheries/Allen Collins. <a href='invertebrates/cnidarians/stalked_jellyfish1_fullsize.jpg'> Download largest ▼ Jellyfish captured at night using a Video Plankton Recorder. Credit: NOAA Fisheries/E. Broughton. <a href='invertebrates/cnidarians/jellyfish4_fullsize.jpg'> Download largest ▼ Jellyfish on conveyor belt. Credit: NOAA Fisheries. <a href='invertebrates/cnidarians/jellyfish3_fullsize.jpg'> Download largest ▼ Jellyfish on conveyor belt being sorted. Credit: NOAA Fisheries. <a href='invertebrates/cnidarians/jellyfish3_fullsize.jpg'> Download largest ▼ Ribbed jellyfish in a plankton sieve just before preservation. Credit: NOAA Fisheries/Jerry Prezioso. <a href='invertebrates/cnidarians/ribbed_jellyfish_fullsize.jpg'> Download largest ▼ Jellyfish in a basket. Credit: NOAA Fisheries. <a href='invertebrates/cnidarians/jellyfish1_fullsize.jpg'> Download largest ▼