Photos from a marine wonderer
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Kidney sponge (Chondrosia reniformis)

kidney_sponge.jpg Kidney sponge (<i>Chondrosia reniformis</i>) reproductionThumbnailsStinker sponge (<i>Ircinia variabilis</i>)?

Commonly seen in the caves around Rhodes. Is always quite fleshy and kidney shaped, though varies in colour (see next photo for white example).