File:Lytechinus variegatus (variegated sea urchin) (Sanibel Island, Florida, USA) 1.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (2,453 × 2,393 pixels, file size: 4.26 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

Lytechinus variegatus (Lamarck, 1816) - variegated sea urchin (aboral side) in Florida, USA (December 2013).

The echinoids are a group of echinoderms - they are starfish relatives. On modern Earth and in the fossil record, echinoids are exclusively marine. Two broad groups exist - the regular echinoids (sea urchins) and the irregular echinoids (heart urchins and sea biscuits and sand dollars).

Sea urchins have subglobular to slightly flattened, radially symmetrical skeletons (tests) composed of calcite (CaCO3 - calcium carbonate). The sea urchin test is covered with spines - these readily detach after death. Sea urchins have a mouth with a pentaradial structure called an "Aristotle's lantern" that is used to graze on algae and other biofilms on hard substrates.

Irregular echinoids have moderately flattened to significantly flattened, bilaterally symmetrically tests of calcite that are covered with small, short, almost hair-like spines. Most irregular echinoids are infaunal and deposit feeders.

The live sea urchin shown above is Lytechinus variegatus, the variegated sea urchin, or short-spined sea urchin.

Classification: Animalia, Echinodermata, Echinoidea, Temnopleuroida, Toxopneustidae

Provenance: marine beach immediately south of Sanibel Inn, southern shoreline of Sanibel Island, southwestern Florida, USA

More info. at:

en.wikipedia.org/wiki/Lytechinus_variegatus
Date
Source Lytechinus variegatus (variegated sea urchin) (Sanibel Island, Florida, USA) 1
Author James St. John

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/25836734536 (archive). It was reviewed on 9 November 2017 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 November 2017

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current00:35, 9 November 2017Thumbnail for version as of 00:35, 9 November 20172,453 × 2,393 (4.26 MB)Sw0 (talk | contribs)=={{int:filedesc}}== {{Information |Description=Lytechinus variegatus (Lamarck, 1816) - variegated sea urchin (aboral side) in Florida, USA (December 2013). The echinoids are a group of echinoderms - they are starfish relatives. On modern Earth and i...

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Lytechinus_variegatus_(variegated_sea_urchin)_(Sanibel_Island,_Florida,_USA)_1.jpg&oldid=894040002"