Littorinidae - Periwinkles

Littorinidae, the "periwinkles" or "winkles" consist of about 180 species worldwide. They usually can be found on rocky shores or jetties in the intertidal zone. Some are found in the quiet waters of mangrove habitats where they live on the trunks or leaves of the mangrove tree. They feed on microscopic algae and other plants. Although they are air breathers, they depend on the water to lay and disperse their eggs which develop into free swimming larvae. There are about 5 species in Texas. They are considered a delicacy in Asian communities but are generally thought to be too small to eat.