DescriptionHomotrema rubrum (encrusting foraminifera) (modern; San Salvador Island, Bahamas) 2 (49718581858).jpg
Homotrema rubrum (Lamarck, 1816) - encrusting foraminifera on an eroded coral clast from the Holocene of the Bahamas.
Homotrema rubrum is a common, reddish-colored, hard substrate-encrusting foraminiferan in the oceanic waters around San Salvador Island. A nearly identical, co-occurring foraminiferan is Miniacina, so identification of red encrusting forams as "Homotrema rubrum" should be done loosely.
The rock itself is actually not a rock - it's an eroded scleractinian coral skeleton, composed of aragonite (CaCO3 - calcium carbonate).
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