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 Archive 500: Daily Pix FULL SIZE
 (For personal use only: NOT public domain)

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Eucidaris thouarsii (Valenciennes 1846), Slate Pencil Urchin. Family Cidaridae. To 10.2 inches in diameter. Sea of Cortez to Ecuador and Galapagos Islands. Ten rows of 5-8 variously sharp/dull club-like spines. Feeds on benthic algae and Pocillopora and Pavona corals. Costa Rica (Pacific side) 2011 

Diadema mexicanum A. Agassiz 1863, Needle Sea Urchin. Costa Rica (Pacific side) 2011
 
Diadema mexicanum A. Agassiz 1863, Needle Sea Urchin. Costa Rica (Pacific side) 2011
 
Echinothrix calamaris (Pallas 1774), the Hatpin Urchin. Indo-Pacific; Red Sea to Hawai'i. Should be kept singly and may prey on cnidarian livestock. Need large spaces in rock to hide amongst by day and coarse substrate. Costa Rica (Pacific side) 2011
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