We found this hydromedusa, Halicreatis, at about 1,200 meters (3,935 feet) depth. The ends of its tentacles are packed with nematocysts (stinging cells), which make them appear especially bright.
Hydromedusa
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 1.4 MB).

We found this hydromedusa at about 1,200 meters depth. The ends of its tentacles are packed with nematocysts (stinging cells), which make them appear especially bright.

Learn more