Largest sea urchin

Last updated: October 10, 2017 at 23:40 pm

Sperosoma giganteum – Test diameter of 38 cm (15 in) (Test: Urchin body without spines). Diadema setosum has a smaller test (10 cm / 4 in) but its spines are the longest measuring more than 30 cm (12 in).

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