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File:Penicillus dumetosus (shaving brush algae) (San Salvador Island, Bahamas) 3 (15425532054).jpg

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Description

Penicillus dumetosus (Lamouroux, 1816) - shaving brush algae on shallow, aragonitic sandy seafloor.

Penicillus is a calcareous green alga - the "brush" contains densely packed bristles having 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 similar to or analogous to Penicillus.

The slender stalks are Syringodium filiforme manatee grass.

Classification: Chlorophyta, Caulerpales, Udoteaceae

Locality: shallow seafloor just west of North Point Peninsula, southeastern Graham's Harbour, northeastern San Salvador Island, eastern Bahamas
Date
Source Penicillus dumetosus (shaving brush algae) (San Salvador Island, Bahamas) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15425532054. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 May 2015

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