The “Leafy Thorny Oyster” is a widely distributed thorny oyster found throughout the Indo-Pacific from Japan to East Africa to Australia but best known from Philippines. Although characterised by spines which broaden at the tip, it is an extremely variable species like many spondylids.
Colour varies from pale to orange to brown, and the formation of spine also differs from specimen to specimen. Adult specimens tend to be uniformly coloured, while juveniles often have attractive contrasting colouration between spines and shell.
It is a common sessile filter-feeding species found most commonly in the depth range of -10~100m. Average size around 90-100mm including spines, very lage specimens often exceeds 140mm. – From Chong Chen’s post
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