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Sechelt Inlet, British Columbia
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ventral view
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dorsal view
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Naked test of Arbacia lixula from Agay (French Mediterranean). One ambulacra seems to have experienced a developmental issue. Licence : CC by-sa 4.0 (https://commons.wikimedia.org/wiki/File:Arbacia_lixula_02.JPG?uselang=fr)
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Arbacia lixula
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Arbacia lixula
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Rab (Croatia)
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Cidaris cidaris preserved specimen from the French Mediterranean, in collection at Muséum d'Histoire Naturelle de Toulouse (MHNT.ZOO.2006.25.1). Lateral view.
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Stylocidaris affinis (aboral view), Portobelo, Caribbean Coast, Panama. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/358).
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Stylocidaris cf. affinis
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Two specimens of Echinocyamus pusillus. The orange mass adhering to their dorsal sides are eggs (left) and sperm (right). Find more pictures on www.medslugs.de/E/Photographers/Peter_Wirtz.htm#photos (http://www.medslugs.de/E/Photographers/Peter_Wirtz.htm#photos)
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Echinocyamus pusillus (O.F. Müller, 1776). Mesa do Con, 9 m (Ría de Arousa, Galicia) Spain.
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Picture of lab specimens Holtmann, S.A. et al. (1996). Atlas of the Zoobenthos of the Dutch Continental Shelf, p. 163. NIOZ: Den Burg, The Netherlands
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Echinus melo from Costa Paradiso, Sardegna. Picture by Fabri (https://www.inaturalist.org/people/fabri).
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Naxos (Greece) Two specimen of Paracentrotus lividus: on the right a rare black specimen. The rare blacks specimens can be confused with Arbacia lixula but the white circular outline on the base of the spines are a features exclusive of P. lividus.