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Diagnosis. Distinguished from congeners in having the following combination of characters: two rows of thorns (strongly hooked and gradually becoming somewhat embedded toward first dorsal fin origin) on mid-dorsum of tail; thorns absent from anterior part of scapular region (Fig. 1 B); thorns on the orbital, nape and scapular regions not encircled by light yellow or white pigment (Fig. 1 B); dorsal surface covered with minute dermal denticles of uniform size and shape, no obvious larger dermal denticles (smooth to touch).