https://scholarspace.manoa.hawaii.edu/items/9670eba3-1546-4f34-932c-91ba17f19dc6
Some ecological observations on tropical rock boring echinoids of the North Pacific
Echinometra oblonga and E. mathaei, two rock-burrowing echinoids, live in positive association on an Hawaiian algal reef. E. oblonga dominates in rough water;...
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