#maretiidae
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Photo
Heart urchin (Maretia planulata)
Photo by Loh Kok Sheng
#heart urchin#sea urchin#maretia planulata#maretia#maretiidae#spatangoidea#brissidina#spatangoida#atelostomata#irregularia#euechinoidea#echinoidea#echinozoa#eleutherozoa#echinodermata
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