A sea spider (Pycnogonida). The long tube hanging down is a proboscis, at the end of which is the mouth. The sea spider can suck up prey items through the proboscis.

Image ID: expl2434, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: North Atlantic Stepping Stones Science Party, IFE, URI-IAO; NOAA/OAR/OER

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