Immediately behind the hump is a series of knuckles or crenulations along the midline. [Please select]
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DORSAL FIN (OR HUMP) Triangular to falcate fin, Rounded hump, two-thirds including a step or hump in back on back followed by front of the dorsal fin; knuckles or crenulations. [Please select]
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In the bottom photo, from the West Indies, note the dorsal hump and the crenulations of bumps which follow it. [Please select]
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