This brown sponge (Agelas conifera) is common on both shallow and deep Caribbean reefs, but grows to enormous proportions on deeper reefs where it can orm long creeping arms extending into the depths.

Image ID: reef3862, NOAA's Coral Kingdom Collection
Location: Caribbean Sea, Cayman Islands
Photo Date: 2007 May 25
Credit: Twilight Zone Expedition Team 2007, NOAA-OE

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