This unobtrusive little sea blister (Ascidia columbiana) is a very low key animal that can easily be missed by divers exploring a rocky reef. When I finally saw this small flattened critter I was intrigued as I had no idea what it was I was observing. On a later dive I noticed the small siphons and managed to get this photo that shows them fairly well. The sea blister is opaque and the tunic spreads out thin towards the edges. The siphons are short and there are many fleshy extensions surrounding both siphons. This small tunicate can grow to 2 inches (5 cm) across, and has a range from Alaska to Washington.