An orange crab's back appears to be hosting a sponge and other biota.
Image ID: expn3659, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Location: hiting Seamount approximately 600 meters
Photo Date: 20150429T183224Z
Credit: NOAA OKEANOS EXPLORER Program, Oceano Profundo 2015; Exploring Puerto Rico's Seamounts, Trenches, and Troughs
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