Paratrygon aiereba (Müller & Henle, 1841): the senior synonym of the freshwater stingray disceus thayeri Garman, 1913 (chondrichthyes: potamotrygonidae)

Abstract

A review of the original descriptions and available types of the South American freshwater stingrays Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843 and Disceus thayeri Garman, 1913 indicates that these three nominal species are synonymous. The senior name, placed in the monotypic genus Paratrygon Duméril, 1865, established for Trygon aiereba, is available and valid. Based on its description, T. aiereba is a freshwater stingray. Therefore, this taxon is not the same as Raja ajereba Walbaum and Raja orbicularis Schneider, both names established for the marine "Aiereba" of Marcgrave, and which preferably should be treated as nomina dubia. Paratrygon does not replace Potamotrygon Garman, 1877 as the type genus, because the family name Potamotrygonidae Garman, 1877 has priority over Paratrygonidade Gill, 1893.<br>A revisão das descrições originais e dos tipos existentes das raias de água doce Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843, e Disceus thayeri Garman, 1913, indica que essas três espécies nominais são sinônimas. O nome sênior, colocado no gênero monotípico Paratrygon Duméril, 1865, estabelecido para T. aiereba, é disponível e válido. A descrição de T. aiereba corresponde claramente a uma raia de agua doce; portanto esta espécie não é um sinônimo de Raja ajereba Walbaum e de Raja orbicularis Schneider, ambos os nomes propostos para a "Aiereba " marinha de Marcgrave, e que preferivelmente devem ser tratados como nomina dubia. Paratrygon não substitui Potamotrygon Garman, 1877 como gênero-tipo, porque o nome de família Potamotrygonidae Garman, 1877 tem prioridade sobre Paratrygonidae Gill. 1893

Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)

“…No nominal genus available for a potamotrygonid can be applied to our new species either. Elipesurus Schomburgk, 1843, following Rosa (1985a, b) and Carvalho et al (2003) cannot be unequivocally applied and is best considered doubtful, whereas Disceus Garman, 1877 is a junior synonym of Paratrygon Duméril, 1865 (for further comments, see Rosa 1990;Carvalho et al, 2003). We note that the first authors to report on the distinctiveness of the new form were Ishihara & Taniuchi (1995), based on a juvenile aquarium specimen reportedly from the Orinoco basin (locality unconfirmed).…”

Systematics of myliobatoid elasmobranchs: with emphasis on the phylogeny and historical biogeography of neotropical freshwater stingrays (Potamotrygonidae: Rajiformes)

“…Compagno & Roberts, 1982Roberts & Karnasuta, 1987;Snelson, Williams-Hooper & Schmid, 1988;Thorson, 1983), fully freshwater rays appear to have only diversified in the Neotropics. The potamotrygonid family comprises some 20 species divided into three genera (two of which are monotypic), and demonstrates a considerable array of morphological variability (Rosa, 1985(Rosa, , 1990Rosa, Castello & Thorson, 1987). All potamotrygonids possess a unique (among elasmobranchs) suite of characteristics related to their obligate freshwater lifestyle.…”

Primer registro de la raya manzana, Paratrygon aiereba (Muller y Henle, 1841) (Batoidea: Potamotrygonidae) para el rio Bita, Orinoquia, Colombia

“…Asimismo, la presencia del saco vitelino sustenta el modo de reproducción vivíparo matrotrófico característico de la familia Potamotrygonidae (Hamlett & Kobb, 1999;Rosa et al, 2010). Rosa (1990), reporta tallas de nacimiento de 10,8 cm de AD para la especie en el Amazonas brasilero, siendo inferior a la que podría presentarse en la Orinoquía colombiana (superior a 16 cm de AD). Así mismo, para el Orinoco venezolano, se plantea una talla de madurez sexual de hembras a partir de los 37 cm de AD (Barbarino & Lasso, 2005, mientras que para el Amazonas brasilero se registra esta talla a partir de los 72 cm de AD (Charvet-Almeida et al, 2005), siendo este último valor superior a la hembra encontrada en este estudio, la cual se encontraba madura y en estado de preñez a los 68 cm de AD.…”