16 Aeolidiella alderi

16 Aeolidiella alderi

The foot is widest at the anterior where it forms a smooth crescent terminating in short, triangular, propodial tentacles. It tapers rapidly near the posterior to a fine point.
It is thin, white and translucent showing the colour of the cerata above and, faintly, the ovotestes within.
Length 8.6 mm. Menai Strait, Wales, September 2016.