Coloration bright and varied, most often of red or yellow tint.
Cold-water species
Small fish larvae often find shelter beneath the umbrella.
The edge of the umbrella carries 16 large lobes and 8 rhopalia. Feeding tentacles have numerous folds. 8 groups of long tentacles originate from the subumbrella surface near the edge of the umbrella. Radial and circular musculature very well developed.
