A large, yellow sponge with an umbrella-like shape attached to the seabed by a long stalk in a dark, deep-sea environment.
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Bolosoma
During Dive 16 of the Papahānaumokuākea ROV and Mapping expedition, a number of large, yellow Bolosoma sponges were observed, some with heads measuring close to a meter in width.
Credit

NOAA Ocean Exploration, 2025 Beyond the Blue