A member of the wentletrap family of snails, this small specimen is about 2/3 inch in length. Its bright yellow color may serve as both camouflage and warning color defense through mimicry; it feeds on yellow corals of the genus tubastrea. I haven't seen any more of these creatures-- I don't know if the smaller snail is an offspring of the larger snail, or just another one taking advantage of a free ride, though it is known that these snails carry their eggs on their shells.
Identification: Epitonium billeeanum
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