File:Clypeaster rosaceus (San Salvador Island, Bahamas) 3.jpg

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Clypeaster rosaceus Lamarck, 1816 - washed ashore onto a rocky shoreline.

Irregular echinoids have somewhat globular skeletons (tests) composed of interlocking calcite plates and covered in short, fur-like spines. The skeleton is bilaterally symmetrical, not pentaradially symmetrical as in the sea urchins. The upper side of the skeleton has the pattern of a 5-petaled star - each petal is an ambulacrum. The mouth and anus are at opposite ends of the long axis of the skeleton. Heart urchins are infaunal deposit feeders - they consume bulk sediments, digest any organic matter mixed in, and excrete large quantities of sediments.

In the specimen shown above, decay has resulted in the spines being detached - the small pustules are spine attachment bases.

Locality: beach landward from Snapshot Reef, Fernandez Bay, western San Salvador Island, eastern Bahamas
Date
Source Meoma ventricosa (red heart urchins) (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@N05/15957279980. It was reviewed on 6 January 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 January 2015

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current00:02, 6 January 2015Thumbnail for version as of 00:02, 6 January 20151,438 × 1,713 (1.17 MB)FredD (talk | contribs){{Information |Description=''Meoma ventricosa'' Lamarck, 1816 - red heart urchin (dead), washed ashore onto a rocky shoreline. Heart urchins (irregular echinoids) have somewhat globular skeletons (tests) composed of interlocking calcite plates and...

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