Potamotrygon boesemani (Chondrichthyes: Myliobatiformes: Potamotrygonidae), a new species of Neotropical freshwater stingray from Surinam

Abstract

Potamotrygon boesemani, new species, is described from the Corantijn river drainage in Surinam. The species has a diagnostic dorsal color pattern formed by deep orange to red ocellated spots of irregular form, encircled by relatively broad black rings. Potamotrygon boesemani is distinguished from other ocellated congeners (P. motoro, P. henlei and P. leopoldi) by the more intensely colored ocelli, which are usually yellow in the latter species. From P. motoro it is also distinguished by the darker dorsal background coloration, by the broader black contour of the dorsal ocelli, and by the irregular form of the ocelli as compared to the more rounded shape in the latter species. From P. henlei and P. leopoldi, it is distinguished by the lack of ocelli on tail. From the tentatively identified specimen of P. ocellata, which also has dark orange ocelli, the irregular contour of the ocelli in the new species is also distinctive. The teeth are relatively smaller and in greater number than in P. motoro and P. ocellata, with up to 45 rows in the upper jaw.Potamotrygon boesemani, espécie nova, é descrita da bacia do rio Corantijn, no Suriname. A espécie apresenta um padrão de coloração dorsal formado por ocelos com coloração alaranjada intensa a vermelha, de formato irregular, margeados por anéis pretos e relativamente grossos. Potamotrygon boesemani distingue-se de outras espécies congêneres oceladas (P. motoro, P. henlei e P. leopoldi) pela coloração mais intensa dos ocelos, que são normalmente amarelados nestas últimas espécies. De P. motoro, distingue-se também pela coloração de fundo mais escura no dorso, pelo contorno preto mais largo nos ocelos dorsais, e pela forma irregular dos ocelos comparada à forma arredondada em P. motoro. De P. henlei e P. leopoldi, distinguese pela falta de ocelos na cauda. Da espécie tentativamente identificada como P. ocellata, que também possui ocelos laranja escuro, o contorno irregular dos ocelos também é distintivo. Os dentes são relativamente menores e em maior número que em P. motoro. e P. ocellata, com até 45 fileiras na mandíbula superior.

<p class="HeadingRunIn"><strong><em>Potamotrygon limai</em>, sp. nov., a new species of freshwater stingray from the upper Madeira River system, Amazon basin (Chondrichthyes: Potamotrygonidae)</strong></p>

“…Currently comprising four genera , the systematics of the group is still poorly known, especially regarding the distribution, evolutionary history and biogeography of its included species Silva & Carvalho, 2011). Of the four recognized potamotrygonid genera (Paratrygon Duméril, 1865, Potamotrygon Garman, 1877, Plesiotrygon Rosa, Castello & Thorson, 1987, and Heliotrygon Carvalho & Lovejoy, 2011, the genus Potamotrygon is the most diverse, with approximately 25 valid species (Carvalho et al, 2003;Rosa et al, 2008;Silva & Carvalho, 2011).…”

A taxonomic and morphological redescription of Potamotrygon falkneri Castex & Maciel, 1963 (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

“…The genera Paratrygon and Plesiotrygon are presently monospecific, whereas Heliotrygon has two valid species (Carvalho & Lovejoy, 2011) and Potamotrygon has approximately 20 valid species (Carvalho et al, 2003;Rosa et al, 2008). Identification at generic level is straightforward, however many species of Potamotrygon are precariously delimited.…”

Phylogeny and taxonomy of Potamotrygonocotyle Mayes, Brooks & Thorson, 1981 (Monogenoidea: Monocotylidae) with a description of four new species

“…For the latter, Deynat (2006) suggested that its diversity is represented by 16 species and Rosa et al (2008) estimated 19 -21 species. The family comprises two monotypic genera, Paratrygon and Plesiotrygon, and the specious Potamotrygon.…”