Eubranchus rupium
Singly arranged cerata have a swelling near the mid-point, but the surface lacks ‘globetti bianchi’ (white. little-globe tipped tubercles).
Small, orange-brown spots scattered over the body and cerata, with a faint brown digestive gland zigzagging between the cerata only in the posterior half of the dorsum.
Aarhus, Denmark, January 2021. © K.K.Kristensen.