Description
Original diagnosis after Villalobos-Segura, Underwood & Ward, 2019 [27618]: Homologous characters: Sclerorhynchoid batoid with estimated total length (TL) well over one metre. Hypertrophied rostrum (31% of total preserved length in holotype specimen) that reaches maximum width away from the base, giving it a leaf shape. No enlarged rostral denticles associated to the rostrum were observed. Chondrocranium rectangular, reaches its maximum width at the nasal capsules and posterior to this region becomes narrower. Chondrocranium roof flattened. Palatoquadrate and Meckel’s antimeres are separated and slender. Dentition relatively homodont, teeth oval in occlusal view and present two well-developed transversal crests, with a variably developed medial cusp between them. Labial visor and lingual uvulae variably developed. Root low with widely spaced root lobes with rounded and flat basal face. Second hypobranchial long and pillar shaped, without an anterior process and no articulation surface with the basibranchial. Ventral portion of the scapulocoracoid is narrow and bar-like, the lateral facet of scapulocoracoid is compact and articulates to the distally expanded and paddle-like proximal pectoral elements (propterygium, mesopterygium and metapterygium). The mesopterygium is square shaped and lacks any process. All pectoral radials articulate directly with the proximal element of the pectoral fin. Pelvic girdle slender and bar like without any process.

Remarks
shark-references Species-ID=15506;

References