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Location of the Arrecife Alacranes National Marine Park in the Gulf of Mexico. A General view of the sampling sites at the Alacranes reef B Southern area of the reef and Perez Island collecting sites.
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Ischnochiton erythronotus (C. B. Adams, 1845), A–H: in dorsal view, showing the tegmentum color variability A specimen from Laguna Arrecifal Desterrada (CNMO4980, 15.2 mm length) B specimen from Isla Perez (CNMO4981, 93.7 mm length) C specimen from Cabaña y Playa CONANP (CNMO4983, 11.7 mm length) and D (CNMO5003, 12.9 mm length) E specimen from Cabezas entre Blanca y Pajaros (CNMO4985, 13.6 mm length) F specimen from Playa Norte (CNMO4988, 14.2 mm length) G specimen from Playa Arrecifal (CNMO4987, 15.2 mm length length) and H, in lateral view. Stenoplax bahamensis Kaas & Van Belle, 1987 I–M: in dorsal view, showing the tegmentum color variability I specimen from Playa Norte (CNMO4942, CNMO4943, 22.1 mm length) J specimen from Pared Arrecifal (CNMO4957, 24.5 mm) K Laguna Desterrada (CNMO4974, 23.4 mm length), and L and M, in dorsal and lateral view (CNMO4974, 22.8 mm length). Calloplax janeirensis (Gray, 1828) N specimen from Isla Perez (CNMO4994, 12.5 mm length), in dorsal view and O (CNMO4990, 13.4 mm length), in lateral view, SB = 1 cm.
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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.
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Stenoplax bahamensis Kaas & Van Belle, 1987. Scanning electron images of specimen from Playa Norte (CNMO4973, 23.6 mm length). A head valve (I) in dorsal view, SB = 1 mm B dorsal view of the 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 intermediate valve IV, showing the adjacent sculpturing of the lateral and central areas, SB = 1 mm. F aesthetes detail of valve IV, SB = 100 μm G girdle scales detail, SB = 50 μm H detail of radular teeth, SB = 150 μm.
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Calloplax janeirensis (Gray, 1828). Scanning electron images of a specimen from Isla Perez (CNMO4981, 13.9 mm length). A dorsal view of head valve (I), 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 pustule detail with aesthetes, SB = 10 μm F girdle scales and hyaline needles, SB = 100 μm G detail of girdle spicules, SB = 50 μm H detail of radular teeth, SB = 100 μm.
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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.
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Tonicia schrammi (Shuttleworth, 1856). Scanning electron images of a specimen from Cabaña CONANP (CNMO4992, 27.5 mm length). A dorsal view of head valve (I), SB = 1 mm B dorsal view of tail valve (VIII), SB = 1 mm C dorsal view of intermediate valve IV, SB = 2 mm D detail of lateral area in dorsal view of the intermediate valve IV, SB = 1 mm E lateral area ocelli detail of intermediate valve IV, SB = 100 μm F head valve (I) detail, showing the ocelli alignment, SB = 50 μm. G, ventral view of intermediate valve IV, SB = 1 mm H insertion teeth and slit detail of intermediate valve IV in ventral view, SB = 50 μm I radular teeth, SB = 100 μm J central and minor lateral teeth detail, SB = 10 μm K major lateral teeth detail, SB = 50 μm.
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Lepidochitona liozonis (Dall & Simpson, 1901). Scanning electron images of a specimen from Isla Perez (CNMO5002, 10 mm length). A dorsal view of head valve (I), SB = 1 mm B dorsal view of tail valve (VIII), SB = 1 mm C dorsal view of intermediate valve IV, SB = 1 mm D detail of aesthetes of valve IV, SB = 100 μm E girdle hyaline spicules, SB = 20 μm F detail of girdle spicules, SB = 10 μm G radular teeth, SB = 50 μm H major lateral teeth detail, SB = 50 μm I detail of central and minor lateral teeth, SB = 20 μm.
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Acanthochitona hemphilli (Pilsbry, 1893). Scanning electron images of a specimen from Agregacion Meros (CNMO4939, 36.5 mm length). A dorsal view of head valve (I), SB = 1 mm B dorsal view of tail valve (VIII), SB = 1 mm C dorsal view of tail valve (VIII), of specimen from Laguna Arrecifal (CNMO4997, 38 mm length), SB = 1 mm D detail of articulamentum of tail valve (CNMO4997), SB = 1 mm E dorsal view of intermediate valve IV (CNMO4939), SB = 1 mm F pustules detail of tail valve (VIII), SB = 100 μm G detail of pustules of intermediate valve IV, SB = 50 μm H detail of girdle spicules, SB = 100 μm I detail of girdle tuft, SB = 1 mm J detail of ventral spicules of girdle, SB = 0.50 mm K radular teeth, showing central and major lateral teeth, SB = 200 μm.
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Acanthochitona roseojugum Lyons, 1988. Scanning electron images of a specimen from Isla Perez (CNMO4995, 3 mm length). A Dorsal view of head valve (I), SB = 200 μm B dorsal view of tail valve (VIII), SB = 200 μm C dorsal view of intermediate valve IV, SB = 200 μm D detail of pustules of intermediate valve IV, SB = 20 μm E girdle spicules, SB = 100 μm F girdle tuft detail, SB = 100 μm G detail of girdle spicules, SB = 10 μm.
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Acanthochitona zebra Lyons, 1988. Scanning electron images of a specimen from Laguna Desterrada (CNMO4993, 9.7 mm length). A dorsal view of head valve (I), SB = 500 μm B dorsal view of tail valve (VIII), SB = 500 μm C dorsal view of intermediate valve IV, SB = 500 μm D ventral view of intermediate IV, SB = 500 μm E intermediate valve IV pustules detail, SB = 100 μm F girdle spicules and tuft, SB = 100 μm G girdle spicules detail, SB = 20 μm H radular teeth, SB = 100 μm.
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Cryptoconchus floridanus (Dall, 1889). Scanning electron images of a specimen from Isla Perez (CNMO4996, 9.3 mm length). A dorsal view of head valve (I), SB = 500 μm C dorsal view of tail valve (VIII), SB = 500 μm E dorsal view of intermediate valve IV, SB = 100 μm F ventral view of intermediate valve IV. Juvenile specimen from Isla Perez (CNMO4996, 7.1 mm length) B dorsal view of tail valve (VIII), SB = 100 μm D dorsal view of intermediate valve IV, SB = 100 μm.
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Cryptoconchus floridanus (Dall, 1889). Scanning electron images of specimen from Isla Perez (CNMO4996, 9.3 mm length). A tegmentum detail, showing the pustules on the head valve (I), SB = 200 μm B head valve pustules detail, SB = 200 μm C jugal area of intermediate valve IV, showing the pustule formation, SB = 200 μm D detail of pustules on jugal area of intermediate valve IV, SB = 200 μm E tail valve jugum of tail valve (VIII), SB = 200 μm F girdle detail, SB = 100 μm G radular teeth, SB = 100 μm H major lateral teeth detail, SB = 50 μm.
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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.