This is a pair of strawberry conch shells (Conomurex luhuanus) engaged in reproduction. The male is in the rear. He has mounted the female, positioning to the female's posterior rear. This allows him to fertilize via the female's siphonal notch. The female is depositing a long, tubular egg mass, which is adhesive and partially buried in the sand. Some of the eggs are visible at full magnification. Photographed in Kagoshima Prefecture, Japan.
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