Styela montereyensis (Long-stalked sea squirt)

Styela montereyensis, also called the Stalked Tunicate, Monterey stalked tunicate, and the Long-stalked sea squirt is a solitary ascidian tunicate. It has a cylindrical, yellow to dark reddish-brown body and a thin trunk that anchors it to rocks. It is found in subtidal areas of the western coast of North America from Vancouver Island to Baja, California.

— Wikipedia