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Maddalena (Italy).
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A purple-spined sea urchin (Arbacia punctulata) at the Flower Garden Banks National Marine Sanctuary, l ocated 70 to 115 miles off the coast of Texas and Louisiana (NOAA picture (http://flowergarden.noaa.gov/about/echinodermlist.html)).
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Sand dollars from a DFO trawl survey.
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Pair of sand dollars, along with a Mysis (bottom) as seen in Manicouagan area.
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Mellita quinquiesperforata, aboral view of denuded test. Bessa Beach, Paraiba, Brazil, South Atlantic Ocean. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/182).
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Fildes Strait in a depth from 15 to 20 m. King George Island
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King George Isl./Maxwell Bay; approximately 10 m of depth.
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King George Isl./Fildes Strait; approximately 30 m of depth.
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Extracted from: David, B., T. Choné, A. Festeau & C. de Ridder (2004). Antarctic Echinoids, an Interactive Database. Editions Universitaires Dijon. Cd Rom
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Abatus beatriceae / left: apical view, right: oral view.
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Abatus cavernosus / left: apical view, middle: oral view, right: apical view (after Mortensen, 1910).
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Abatus cordatus / left: apical view, right: brooding pouch.
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Abatus curvidens / left: apical view, right: oral view.
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Abatus ingens / apical views, lower right: valve of globiferous pedicellaria.
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Abatus philippii / left: apical view, right: oral view.
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Abatus shackletoni / left: apical view, right: oral view.
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Antrechinus drygalskii / left: apical view, right: oral view, (after Mortensen, 1909).
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Antrechinus mortenseni (after Mooi & David, 1993).
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Longitudinal section of a female of an extant Antarctic brooder, Antrechinus mortenseni. This interior view of the test shows two brood pouches, each of which contains a juvenile at a different stage of development. Also shown are different internal organs (gonoducts, ovaries, water vessels, etc.) and the birth canal through which the young move as they are released to the external environment through enlargement of the apical aperture. from David, B., Mooi, R., Néraudeau, D., Saucède, T. & Vilier, L. 2009. Évolution et radiations adaptatives chez les échinides. Comptes Rendus Palevol 8, 189–207.