Rough Sea Squirt

"Styela clava" is a solitary, subtidal ascidian tunicate. As its common names suggest, "S. clava" is club-shaped with an elongated oval body and a long peduncle for attaching to a substrate. Although native to the northwestern waters of the Pacific Ocean, since the 1900s, "S. clava" has become an increasingly successful invasive species outside of its native range.