Rhinobatos Linck, 1790

Last, Peter R., Séret, Bernard & Naylor, Gavin J. P., 2016, A new species of guitarfish, Rhinobatos borneensis sp. nov. with a redefinition of the family-level classification in the order Rhinopristiformes (Chondrichthyes: Batoidea), Zootaxa 4117 (4), pp. 451-475 : 470

Genus Rhinobatos Linck, 1790

Type species. Raja rhinobatos Linnaeus, 1758 (not indicated in original description but assumed type by absolute tautonymy).

Description. Nostril slightly longer to much longer than internasal distance; posterior aperture narrow, relatively short, slightly oblique to anterior aperture. Anterior nasal flaps bilobed, not fused to form a nasal curtain, bases short to moderately elongate (usually slightly less than or equal to half nostril width); insertion of anterior nasal flap well within internasal space (not closely adjacent nostril margin), and well anterior to innermost corner of posterior aperture (insertions of flaps widely separated, about equal to internasal distance); anterior aperture medium-sized, suboval, medial edge formed by long outer lobe-like extension of anterior nasal flap; inner lobe of anterior nasal flap narrow to rather broad with an oblique, almost straight to strongly convex margin; lateral and posterior margins of anterior aperture bordered by a wide to broad posterolateral nasal flap, extending posteromedially as free lobe to about middle of posterior aperture of nostril; posterior nasal flap moderately to very well developed, width similar to or much broader than posterolateral nasal flap (base shorter to much longer than posterior aperture length), often very broad and extending almost to innermost corner of nostril. Lower jaw straight to weakly convex; skin margin forming upper lip straight to concave; 2–3 lateral grooves at its angle; oral groove weak to moderate, extending from beside jaws around chin.

Species. R. albomaculatus Norman, 1930 , R. annandalei Norman, 1926 , R. borneensis Last, Séret & Naylor, 2016 , R. holcorhynchus Norman, 1922 , R. hynnicephalus Richardson, 1846 , R. irvinei Norman, 1931 , R. jimbaranensis Last, White & Fahmi, 2006 , R. lionotus Norman, 1926 , R. nudidorsalis Last, Compagno & Nakaya, 2004 , R. penggali Last, White & Fahmi, 2006 , R. punctifer Compagno & Randall, 1987 , R. rhinobatos (Linnaeus, 1758) , R. sainsburyi Last, 2004 , R. schlegelii Müller & Henle, 1841 , R. whitei Last, Corrigan & Naylor, 2014 .