|Family||Scientific Name||Author||Year||Common Name|
|Acanthuridae||Acanthurus coeruleus||Bloch and Schneider||1801||Blue Tang|
Unique Characters: Anal-fin soft rays 24-26. Dorsal-fin soft rays 26-28. Body very deep, the depth about 1.7 in standard length. Color of adults in life blue to purplish grey with grey longitudinal lines on body. Base of caudal fin not pale. Color of juveniles in life bright yellow.
Similar Species: Doctorfish Acanthurus chirurgus. Anal-fin soft rays 21-23. Dorsal-fin soft rays 23-26. Body not very deep, the depth about 2.0 in standard length. Ground color of adults in life light yellowish brown to dark greyish brown. Base of caudal fin usually pale (often white). Color of juveniles in life not yellow. About 10 narrow dark bars on side of body. Caudal fin without a distinct pale posterior margin (either absent or the width of a pencil line).