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Archive 1296: Daily Pix FULL SIZE
(For personal use only: NOT public domain)
Mmm, right click, add, set as background...

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Eucidaris tribuloides (Lamarck 1816), Mine, Pencil, Club Urchin. Tropical West Atlantic. Solitary, hiding by day. Live on algae, bryozoans, sponges, tunicates in the wild. Algae and opened shellfish in captivity. To about three inches in diameter. Bonaire photo.

Heterocentrotus mammillatus (Linnaeus 1758), the (Red) Pencil Urchin. Indo-Pacific; Red Sea to Hawai'i. Nocturnal, hiding in crevices by day in depths to thirty feet, emerging at night to rasp rocks. To one foot overall diameter. Hawai'i picture. 

An image to show you what cooler water Urchins can/do look like. The larger, redder individual in the upper part of the frame is the larger species, Strongylocentrotus sanfriscanus, the ones in the foreground are the more common, smaller Strongylocentrotus purpuratus. Both have their eggs used in the sushi bar business as uni.

Mespilia globulus (Linnaeus 1758), the Blue Tuxedo Urchin (Sphere Urchin of science). Eastern Indian Ocean to western Pacific... in shallows amongst algae it grazes on. To three inches in diameter. Needs hard substrates, shady areas. Can be kept solitarily or in small groups. Eats mainly algae, including corallines. N. Sulawesi pic.
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