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Cassiosomes_cropped.jpg

These popcorn-shaped objects are tiny balls of jellyfish cells called cassiosomes. The white dots on the outer edges of the lumps are stinging structures called nematocysts. The brownish circles in the middle are symbiotic algae.

Image credits:

Cheryl Ames and Anna Klompen

Rights information:

This image may only be reproduced with this Inside Science article.