Tonicia schrammi (Shuttleworth, 1856), A preserved specimen, showing the color change B life specimen coloration from Cabaña CONANP (CNMO4992, 28.5 mm length) C same specimen in lateral view, SB = 1 cm. Lepidochitona liozonis (Dall & Simpson, 1901) D dorsal view and E lateral view of a specimen from Isla Perez (CNMO5002, 10 mm), SB = 1 cm. Acanthochitona hemphilli (Pilsbry, 1893) F dorsal view of a specimen from Laguna Arrecifal (CNMO4997, 34.8 mm length), SB = 1 cm. Acanthochitona roseojugum Lyons, 1988 G in dorsal view and H detail of valve IV and V in lateral view, of specimen from Isla Perez (CNMO4995, 3 mm length), SB = 1 mm. Acanthochitona zebra Lyons, 1988 I dorsal view of a life specimen J same specimen in preserved conditions K in lateral view of same specimen from Cabaña CONANP (CNMO4979, 9.2 mm length), SB = 5 mm. Cryptoconchus floridanus (Dall, 1889) L dorsal view of life specimen M lateral view of same specimen under preserved conditions from Isla Perez (CNMO4996, 9.3 mm length), SB = 5 mm N (CNMO4996) and O (CNMO5560, 20.3 × 8.3 mm length, Banco Chinchorro, Quintana Roo), shows the length comparison, SB = 1 cm.