16 Onchidoris bilamellata COMPARISON Onchidoris muricata

16 Onchidoris bilamellata COMPARISON Onchidoris muricata

Onchidoris muricata, length 8 mm (max. 14 mm), is sometimes confused with juvenile, rare, all-white O. bilamellata. It is distinguished by its small, unobtrusive gill circle, and because its club-shape tubercles are more evenly sized than on O. bilamellata.
Menai Strait, Wales. March 2012.