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Archive 1295: Daily Pix FULL SIZE
(For personal use only: NOT public domain)
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Diadema savignyi (Michelin 1845), a Long-Spined Sea Urchin. Indo-Pacific; Africa to the South Pacific. Test about five inches maximum diameter, with spines to sixteen. Black, grey, brown in color. Have green to blue lines in their interambulacral aborally (on top). Lack the orange ring around the anus of D. setosum (below). Hide in shade by day, scouring the reefs by night. Blue ring around anus is indicative of this species. A frequent contaminant on/in live rock imports. Fiji pic here.

Diadema setosum (Leske 1778), the Hatpin Urchin. Indo-Pacific; Red Sea to South Pacific, Japan. To about four inches in diameter. Useful in coral bearing aquariums as these echinoids avoid their rocks. A frequent "contaminant" on live rock imports. Painful to get stuck by... Red ring around anus and five white dots are definitive. A juvenile in N. Sulawesi, Indo.

Chondrocidaris gigantea, A. Agassiz 1863, the Rough-Spined Urchin. Dark Larger outer spines covered with fouling organisms (algae, sponges, bryozoans...). Relatively short, secondary spines are clean. Hawai'i and New Caledonia at depths of usually 30 meters plus. Hawai'i pic.  

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. Common in the Galapagos. Found on rocky shore shallows to 150 meters depth. Galapagos pic.
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