| systematics and morphology of potamotrygon orbignyi (castelnau, 1855) and allied forms (chondrichthyes: myliobatiformes: potamotrygonidae). | the neotropical freshwater stingray potamotrygom orbignyi (castelnau, 1855), and other similar "reticulated" species occurring in northern south american basins, were submitted to a thorough taxonomic analysis based on an extensive external and internal morphological study. the identity of p. orbignyi and the taxonomic status of the related nominal species potamotrygon dumerilii (castelnau, 1855), potamotrygon reticulata (günther, 1880), and potamotrygon humerosa garman, 1913, are defined. taxon ... | 2015 | 26250018 |
| rhinebothrium jaimei sp. n. (eucestoda: rhinebothriidea: rhinebothriidae): a new species from neotropical freshwater stingrays (potamotrygonidae). | neotropical freshwater stingrays (batoidea: potamotrygonidae) host a diversity of parasites, including some, like their hosts, that are marine-derived. among the parasites of potamotrygonids, the cestode fauna is the most diverse, with multiple genera having been reported, including genera endemic to the freshwaters of the neotropics and genera that have cosmopolitan distributions. recent efforts have been made to document the diversity of cestodes of this host-parasite system and to refine the ... | 2015 | 26449468 |
| monogenoidean parasites of freshwater stingrays (rajiformes: potamotrygonidae) from the negro river, amazon, brazil: species of potamotrygonocotyle (monocotylidae) and paraheteronchocotyle (hexabothriidae). | five new species of potamotrygonocotyle (monocotylidae) are described and paraheteronchocotyle amazonense mayes, brooks et thorson, 1981 (hexabothriidae) is redescribed from monogenoideans collected on the gills of species of potamotrygonidae from the negro river, amazon, brazil. potamotrygonocotyle quadracotyle sp. n. and p. umbella sp. n. were found parasitizing an undescribed species of potamotrygon; potamotrygonocotyle rarum sp. n. is described from potamotrygon schroederi; potamotrygonocoty ... | 2007 | 19245189 |
| chromosomes of three freshwater stingrays (rajiformes potamotrygonidae) from the rio negro basin, amazon, brazil. | potamotrygonidae is the representative family of south american freshwater elasmobranchs. it is a monophyletic group containing 20 species grouped into three genera. three species belonging to two genera of this family were collected from the middle negro river, amazonas, brazil, and studied cytogenetically: paratrygon aiereba, potamotrygon motoro and potamotrygon orbignyi. paratrygon aiereba presented 2n = 90 chromosomes and 4m+2sm+10st+74a. both species of potamotrygon presented 2n = 66 chromo ... | 2006 | 17028938 |