15 Thecacera pennigera

15 Thecacera pennigera

The translucent white sole has a variable number of opaque black spots. There are no oral tentacles or oral veil with elongate processes, but the head expands on each side into a wide lateral flap (1) to conceal the white propodial tentacles (2). Length 20.2 mm. On Bugula on pier piles at ELWS. Menai Strait, Wales, September 2016.