My first observation of one years ago, and have only seen a handful since. This individual was living in a pipe on the wreck of the Haight. It got defensive because I initially got too close, too fast. I took a few pictures and left it alone. In front of the pipe there was a shell debris field - mostly crabs, anyone who had the misfortune of walking too close to the pipe.
There were countless individuals observed for 2 days. Went with this ID because the lobes look longer than the body. I'm still learning how to photograph these, they have almost no color and are difficult to properly expose.