Acanthochitona zebra Lyons, 1988, A holotype (USNM859319), from Silver Cove Canal Freeport, Grand Bahama Island, specimen of 15 mm length; A1, in lateral view; A2, in dorsal view, SB = 10 mm. Lepidochitona liozonis (Dall & Simpson, 1901) B holotype (USNM161920), from Culebra Island, Ensenada Honda, Puerto Rico, specimen of 13.5 mm length; B1, curled chiton in dorsal view showing intermediate valves II-IV; B2, curled chiton in dorsal view showing intermediate valves IV-V; B3, curled chiton in dorsal view showing intermediate valves VI-VIII. Disarticulated valves; B4, head valve in dorsal view; B5, head valve in frontal view; B6, head valve in ventral view, SB = 5 mm. Calloplax janeirensis (Gray, 1828) C lectotype (NHMUK 1977041/2), from Brazil Rio de Janeiro, specimen of 16.2 mm length. C1, in lateral view and C2, in dorsal view, SB = 15 mm. Tonicia schrammi (Shuttleworth, 1856) D dorsal view of a paralectotype (NMBE19115/5a), from West Indies, Guadeloupe, specimen of 29 mm length, SB = 10 mm. Stenoplax floridana (Pilsbry, 1892), from Banco Chinchorro, Quintana Roo (CNMO5557) E specimen of 26.7 mm length, in dorsal view showing intermediate valves III-VII, SB = 5 mm F same specimen in dorsal view, showing intermediate valves VI-VIII, SB = 5 mm G detail of intermediate valve IV in dorsal view, showing the pustule formation near the diagonal ridge.