Valve v (upper image), viewed from posterior, compared with valve iv of Leptochiton cancellatus.
Distinct keel (1) on L. cinerea. Smoothly rounded summit (2) with no trace of a keel on Leptochiton cancellatus. Other differentiating features in text of “similar species” at 01 Lepidochitona cinerea and below image 26 Lepidochitona cinerea

KEY ID FEATURES and similar species at: 01 Lepidochitona cinerea