The dark form of Echinothrix calamaris at Lizard Island, at night. Test diameter about 10 cm. Note swollen periproct with white flecks.
© Anne Hoggett
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Creative Commons Attribution 3.0 Unported License
The dark form of Echinothrix calamaris at Lizard Island, at night. Test diameter about 10 cm. Note swollen periproct with white flecks.
© Anne Hoggett