Eubranchus rupium. Cerata arranged singly on each side. They have a variable swelling near the mid-point, but the surface lacks ‘globetti bianchi’ (white, little-globe tipped tubercles). Body and cerata have scattered small, orange-brown spots and a distinct, green, digestive gland zigzagging between the cerata in the posterior half of the dorsum. In the anterior half, the digestive gland is fragmented and does not cross from side to side.
Oosterschelde, Netherlands, June 2020. © G. Biscop.