Sea Lice (Linuche unguiculata)

Warm, tropical, and subtropical coastal waters, particularly in the Caribbean and Gulf of Mexico.

They feed on plankton and small organic particles found in the water column.

The larvae, known as the 'sea lice' that cause Sea Bather's Eruption, are often found in large swarms near the surface. They become trapped under swimwear or hair, where pressure causes them to fire their stinging cells (nematocysts).

Risks include Sea Bather's Eruption, an itchy, red rash that occurs on skin covered by swimwear. While not dangerous, it can be very uncomfortable. They serve as a food source for various marine organisms in the ecosystem.