Fresh specimens with yellow caudal fin and blackish peduncular plate; preserved specimens uniform grey in color and dark fins (pectorals pale). Oblique groove on side of snout below nostrils, its length about equal to length of naked area enclosing nostrils (Ref 9808).
Description: Characterized further by having black caudal spine; absence of horn or protuberance on forehead; single plate with large, sharp spine on each side of caudal peduncle; greatest depth of body 2.9-3.3 in SL (Ref. 90102).
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