Shell of the Week: The Inconspicuous Side-gill Slug
The sea slug Pleurobranchaea inconspicua Bergh, 1897 measures up to 60 mm (about 2.4 inches). It typically has the foot with a wide frontal part (the veil) and covered with small papillae (projections). The gills, visible in the photo, are partially covered by the mantle, and the mantle forms a small siphon in the rear part of the animal. The photo was taken by Barry McBroom at Blind Pass, Sanibel, in January 2018.