Ischnochiton erythronotus (C. B. Adams, 1845). Scanning electron images of a specimen from Laguna Arrecifal Desterrada (CNMO4980, 15.2 mm length); A head valve (I) in dorsal view, SB = 1 mm. B dorsal view of tail valve (VIII), SB = 1 mm C dorsal view of intermediate valve IV, SB = 1 mm D ventral view of intermediate valve IV, SB = 1 mm E detail of aesthete system, white arrows indicating the megalaesthetes, black arrows indicating the micraesthetes of intermediate valve IV, SB = 10 μm F girdle scales detail, SB = 100 μm G detail of radular teeth, SB = 100 μm.