Lambis lambis, common name the spider conch, is a species of large sea snail, a marine gastropod mollusc in the family Strombidae, the true conchs.

One of its most striking characteristics is its flared outer lip, ornamented by six hollow marginal digitations.

These digitations present subtle differences in shape between genders in this species, as the three anteriormost digitations are short and posteriorly bent in male individuals, and longer and dorsally recurved in females.

[1] The color of the shell is highly variable, being white or cream externally and often presenting brown, purplish or bluish black patches.

[1][2] This sea snail lives in mangrove areas, as well as reef flats and coral-rubble bottoms in shallow water from low tide levels to depths of 5m.