Many-ribbed jellyfish

Rhacostoma atlanticum

Family Aequoreidae - hydroids

Bell gelatinous, bowl-shaped, broader than deep; no color, translucent to transparent; has radiating canals that feel like ridges; rows of wart-like bumps on underside of bell; center of bell has circular area smooth with no ridges; tentacles very fine, small, do not sting.
Similar Species
Similar to another hydrozoan, Aequoria, which does not have the warty bumps and is smaller in size.
Gulf, pelagic
Maximum Size
40 cm (15 3/4 in) bell diameter
Other Common Names
crystal jelly, water jelly
Previous Scientific Names
This is not a true jellyfish. It's actually a hydroid.