Centrocidaris doederleini: Not a Lonely Urchin in Galápagos!
(Photograph by Dave Pawson)

Previously known from only a few specimens and thought to be extremely rare, Centrocidaris doederleini was observed in great numbers in Galápagos, especially on a sand bottom off Marchena Island at about 300 meters depth. Pawson & Ahearn (In Press) estimate the density of this species from submersible video footage as approximately 185 individuals per square meter (60 mm diameter). 

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