20 Boreochiton ruber COMPARISON image of Tonicella marmorea on left, chiton length 29mm, leg. S. Taylor & D. McKay, Lewis 2018. Boreochiton ruber on right, at same scale, chiton length 14.5mm, leg. P. Lightfoot, N. Yorkshire, 2014.

20 Boreochiton ruber COMPARISON image of Tonicella marmorea on left, chiton length 29mm, leg. S. Taylor & D. McKay, Lewis 2018. Boreochiton ruber on right, at same scale, chiton length 14.5mm, leg. P. Lightfoot, N. Yorkshire, 2014.

1: dorsal surface of girdle (perinotum) on T. marmorea has widely spaced, minute granules/ spicules that usually escape notice in photographs.
2: dorsal surface of girdle (perinotum) on B. ruber has club-shaped spicules with densely-packed, touching heads giving a mealy appearance.
3: marginal fringe of spicules can often be detected on B. ruber but difficult to see on T. marmorea.

KEY ID FEATURES and similar species at: 01 Boreochiton ruber. Length 12mm. North Yorkshire. September 2014. (leg. Paula Lightfoot).