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Eucidaris metularia from Mayotte, western Indian ocean.
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Prionocidaris baculosa observed in Philippines. Picture (https://commons.wikimedia.org/wiki/File:Prionocidaris_baculosa.jpg?uselang=fr) by Andrey Ryanskiy.
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Eucidaris tribuloides (aboral view), collected off of Piedra de Galera, San Blas, Caribbean coast, Panama. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/217).
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Histocidaris variabilis observed in deep waters off to Hawaii by NOAA Okeanos Explorer mission (Hohonu Moana Okeanos Explorer Expedition (http://oceanexplorer.noaa.gov/okeanos/explorations/ex1504/welcome.html)). Note that the white "galls" on the spines are symbiotic barnacles.
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Phyllacanthus parvispinus observed close to shore at Bare Island, Sydney, NSW.
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Cidaris blakei seen in the abyss off to Puerto Rico by NOAA mission Okeanos Explorer in 2015 ("Exploring Puerto Rico’s Seamounts, Trenches, and Troughs").
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Tretocidaris bartletti (JSLII-1516, 696ft), courtesy of Smithsonian Institution / Harbor Branch Oceanographic Institution.
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Centrocidaris doederleini, oral view. Gulf of Chiriqui, Panama, eastern Pacific. ID & Photographer : Simon E. Coppard (http://echinoderms.lifedesks.org/gallery?page=10).
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Centrocidaris doederleini, aboral view. Gulf of Chiriqui, Panama, eastern Pacific. ID & Photographer : Simon E. Coppard (http://echinoderms.lifedesks.org/gallery?page=10).
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Chondrocidaris brevispina from Moorea (French Polynesia). Picture courtesy of Moorea Biocode (https://calphotos.berkeley.edu/cgi/photographer_query?where-name_full=Biocode+MINV+Team&one=T).
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Adult: aboral side. from McCormack, Gerald (2007) Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Online at http://cookislands.bishopmuseum.org used with permission
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Adult: oral side (right) and spine detail. from McCormack, Gerald (2007) Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Online at http://cookislands.bishopmuseum.org used with permission
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Eucidaris thouarsii observed in Baja California (off La Paz).
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Eucidaris thouarsii (aboral view), collected from Isla Taboguilla, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/194).
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A young Goniocidaris tubaria from southern Australia. Picture by Ashley Miskelly / seaurchins.com.au. Image courtesy of Museum Victoria (https://collections.museumvictoria.com.au/species/14314).
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Hesperocidaris dubia (aboral view), Gulf of Chiriqui, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/191).
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Hesperocidaris panamensis, collected from Ladrones Island, Gulf of Chiriquí, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/324).
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Hesperocidaris perplexa (aboral view), collected between Isla del Rey and the Darien, Gulf of Panama, Panama, eastern Pacific from a depth of 60 m. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/318).
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Phyllacanthus irregularis at the northeast point of Mondrain Island, Western Australia.
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Plococidaris verticillata seen in Mtsamboro, Mayotte (western Indian ocean).
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Stereocidaris hawaiiensis observed by NOAA Okeanos Explorer deep-water mission off to Hawaii in 2015.
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aboral view of the holotype from Fell, H. B. 1958. Deep-Sea Echinoderms of New Zealand. Zoology Publications from Victoria University of Wellington 24, 1-40.
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ambital ambulacral plates from Fell, H. B. 1958. Deep-Sea Echinoderms of New Zealand. Zoology Publications from Victoria University of Wellington 24, 1-40.
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Eucidaris galapagensis observed close to Puerto Ayora, Galapagos. Picture (https://www.inaturalist.org/observations/7754497) by Souhjiro (https://www.inaturalist.org/people/souhjiro).
