Left: length 12 mm. Adriatic Sea, Croatia. © J. Prkic.
Centre: Cornwall, England. August 2012. © N. Ward.
Right: N. Yorkshire, England. June 2014. © P. Lightfoot.
Colours vary greatly on this species. Bright colours (left and centre) may correlate with cleaner habitats and/or brighter sun in more southern localities. Often coated with detritus (right).

KEY ID FEATURES and similar species at: 01 Acanthochitona crinita