This urchin was particularly interesting due to its barbed spines and brittle star associates.
Urchin
Image courtesy of the NOAA Office of Ocean Exploration and Research, Exploring Puerto Rico’s Seamounts, Trenches, and Troughs. Download larger version (jpg, 1.5 MB).

Sea urchins were fairly common throughout the expedition, but this one was particularly interesting due to its barbed spines and brittle star associates.

Learn more