Pascal Kobeh / Detail of a banded urchin (Echinotrix calamaris) with its anus clearly visible. Sulu Sea, Philippines.
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David Fleetham / Sea urchin crab (Echinoecus pentagonus), female inside Common banded urchin (Echinothrix calamaris) rectum. Hawaii.
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Georgette Douwma / RF - Calamari urchin (Echinothrix calamaris). Cebu, Malapascua Island, Philippines. (This image may be licensed either as rights managed or royalty free.)
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Georgette Douwma / Urchin (Echinothrix calamaris) Indonesia.