Diagnosis |
This medium sized whipray is distinguished by the following characters: disc rhombic, small head (39-41% WD); internasal width 8.3-8.8% WD; small oval to heart-shaped mid-shoulder denticle, with obvious denticle band in adults; tail whip-like without skin folds, upper surface variably white-spotted; disc rather flat, wider than long, length 76-87% WD; pectoral-fin apex rounded to somewhat angular; snout broad with enlarged triangular apical lobe, the anterior margins weakly concave; eyes are small and potruding slightly, length of orbit and spiracle ca. 2 in snout length, interorbital space 1.9-2 times the orbit length; mouth arched, 2-5 oral papillae (medial pair enlarged); labial furrows and folds are prominent; lower jaw arched slightly; nasal curtain is subrectangular, the posterior margin finely fringed; mid-shoulder denticle small and only slightly larger than smaller denticles adjacent; in adults the denticle band is well-developed with slow development in young; tail is very long and slender, 2.8-3.4 times WD in length; slightly depressed in cross-section and tapering gently and evenly toward caudal sting, then weakly beyond the sting; with usually one caudal sting; tail beyond caudal sting is sparsely covered with denticles (Ref. 114953). |