DescriptionUdotea flabellum (mermaid's fan algae) (San Salvador Island, Bahamas) 3 (15861991769).jpg
Udotea flabellum (Ellis & Solander, 1786) - mermaid's fan alga on shallow, aragonitic sandy seafloor.
Udotea is a calcareous green alga - the fan-shaped blade has tiny particles of aragonite (CaCO3 - calcium carbonate). After the alga dies and the soft parts decay away, the aragonitic portions become clay- & silt-sized seafloor sediments. A significant percentage of shallow seafloor and shoreline sediments in the Bahamas is from calcareous algae. Many carbonate petrologists suggest that ancient fine-grained limestones (micritic limestones; micrites) are diagenetically altered deposits of calcareous green algae.
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