Tropical Periwinkle

Planaxis sulcatus

Planaxis sulcatus is a small marine snail that typically measures between 13 mm and 35 mm in shell size. The shell is often adorned with patterns of black, white, or beige, which can help distinguish it from similar species. This species thrives in the warm waters of the Red Sea and the Indian Ocean, particularly off the coasts of Mozambique, Kenya, Madagascar, Tanzania, Mauritius, Chagos, Aldabra, and the Mascarene Basin. It is also found near the Pakistani coast, especially in Sonmiani Bay. Tropical Periwinkles are usually located in shallow waters, typically at depths ranging from 0 to 1 meter, often around rocky intertidal areas and rubble in sheltered environments. They feed primarily on microalgae, contributing to the benthic ecosystem in which they reside. This species exhibits a reproductive strategy known as poecilogonony, which allows for varied developmental modes in its offspring. Encounters with Tropical Periwinkles during dives can be quite common, as they are often found in their preferred habitats. Divers may observe them grazing on algae on rocky surfaces or nestled among rubble. As of now, the IUCN has not evaluated the conservation status of Planaxis sulcatus, so its population trends remain unknown.