Abalone shells and pearls. Black abalone (Haliotis cracherodii)-1; Red abalone (H. rufescens-2; Green abalone (H. fulgens)-3; Common boring mollusc (Pholadidea parva) which causes the formation of blister pearls-4; Another mollusc (Adula stylina) which bores into the heavy rim of the abalone shell-5; Exterior of the abalone shell showing the aperture of the bore of the parasitic mollusc-6; Abalone pearl-7
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