West Indian Topsnail

Cittarium pica is a large marine gastropod in the family Tegulidae, recognizable by its heavy, top-shaped shell marked with irregular black-and-white streaks and a pearly, iridescent underside once the outer layer wears away. It grazes on algae and organic detritus across intertidal and shallow subtidal rocky shores, playing a role in controlling algal growth and cycling nutrients in these coastal zones. Adults can reach several centimeters in shell diameter and are commonly found clustered on exposed rock surfaces, cliff bases, and rubble within reach of wave splash.

The species ranges throughout the wider Caribbean basin and adjacent Atlantic coasts, including Bermuda, the Bahamas, the Antilles, and coastal areas of Central and South America, with additional occurrences noted in other tropical and subtropical regions. It depends on hard-substrate intertidal and shallow marine habitats.

Populations have declined due to sustained harvesting for food and for the ornamental shell trade, a practice with deep historical roots in the region that has intensified with growing coastal populations and tourism demand. Coastal development destroys or fragments intertidal habitat, while runoff-associated pollution degrades water quality in nearshore zones. Ocean acidification poses an emerging risk to shell formation and strength, and sea level rise is altering the intertidal areas the species depends on.

Some Caribbean jurisdictions have introduced harvest regulations, size limits, or seasonal closures to manage exploitation, and the species is monitored under regional fisheries and conservation frameworks. Population trends remain unknown due to limited systematic monitoring. Given continued harvesting pressure combined with habitat and climate-related stressors, the species' conservation outlook remains uncertain without stronger enforcement and broader regional data collection.

This large marine gastropod inhabits rocky intertidal zones and shallow subtidal areas along Caribbean coastlines, typically found on wave-exposed shores with hard substrates. The species prefers areas with abundant algae and seagrass beds that provide food sources, ranging from the splash zone to depths of approximately 10 meters.