Bayerotrochus pyramus, common name the pyramus slit shell, is a species of large sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.

[2][3] The shell reaches a length of 64 mm.

This marine species occurs in the Lesser Antilles off Guadeloupe, St Lucia and Martinique at depths between 400 m and 560 m.

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