Sand Tunicate

Eudistoma psammion

Eudistoma psammion is a species of tunicate characterized by its sessile lifestyle, often found attached to substrates in coastal waters. This species exhibits a colonial form, which can make it challenging to distinguish from similar tunicates. It is typically located in the American western coastal waters, ranging from the State of Washington down to San Diego in California. Sand Tunicates are often found in shallow depths, with 98% of recorded occurrences being shallower than 40 meters, and 90% occurring at depths of about 10 meters or less. As a hermaphroditic organism, Eudistoma psammion has the capability for both cross- and self-fertilization. Its life cycle begins with eggs developing into lecithotrophic larvae, which eventually metamorphose into benthic adults. This reproductive strategy allows for a flexible approach to breeding, contributing to its presence in various habitats. Diving encounters with Sand Tunicates can be intriguing, as divers may observe these organisms clustered together on rocky substrates or sandy bottoms. Their colonial nature can create interesting patterns, providing a unique sight for underwater exploration. The conservation status of Eudistoma psammion is currently not evaluated, indicating that further research may be needed to understand its population dynamics and ecological role.