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Phormosoma placenta (aboral view of naked test), collected off the Bahamas, North Atlantic Ocean, from a depth of 247 m.
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Kamptosoma asterias / left: apical view, right: oral view (after Mortensen, 1935).
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Araeosoma thetidis observed in situ at a depth of 188 m from off the north of New Zealand. Picture (https://commons.wikimedia.org/wiki/File:Araeosoma_thetidis_insitu.tif?uselang=fr) courtesy of Dr. Owen Wilson (National Institute of Water and Atmospheric research)
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Indian ocean leather urchin Asthenosoma marisrubri observed off Marsa Alam, Egypt. Picture (https://www.inaturalist.org/observations/2794629) courtesy of Ronald Werson.
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30.12.2019 27°42'11.57"N 34° 7'40.90"E Beacon Rock Dunraven, nightdive
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30.12.2019 27°42'11.57"N 34° 7'40.90"E Beacon Rock Dunraven, nightdive
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02.01.2020 27°11'09.90"N 33°58'56.42"E Small Giftun, nightdive
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Araeosoma leptaleum, aboral view. Collected off Isla Montuosa, Gulf of Chiriqui, Panama, eastern Pacific, from 2200 ft. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/302).
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Asthenosoma intermedium, Recto verso. Plate 26 (Clark, 1938).
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Holotype of Retzneiosoma jaseneki Kroh, 2005 (NHMW 2003z0071/0002) from the Badenian (= Middle Miocene) of Retznei, Austria Kroh, A. 2005. Catalogus Fossilium Austriae. Band 2. Echinoidea neogenica, pp. lvi+210. Österreichische Akademie der Wissenschaften; Wien.
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Holotype of Retzneiosoma jaseneki Kroh, 2005 (NHMW 2003z0071/0002) from the Badenian (= Middle Miocene) of Retznei, Austria Aboral view showing imbricate plates, “membranous” gaps, and aboral tuberculation (A). Notice that large parts of the aboral surface are missing exposing the lantern and the inside of the oral surface (B; showing ambulacral plating). Kroh, A. 2005. Catalogus Fossilium Austriae. Band 2. Echinoidea neogenica, pp. lvi+210. Österreichische Akademie der Wissenschaften; Wien.