Results 11 to 20 of about 414 (162)

First report of Vandellia sp. parasiting the Raspy river stingray Potamotrygon scobina in the Amazon basin [PDF]

Revista Brasileira de Parasitologia Veterinária
This study reports the first record of candiru, Vandellia sp. parasitizing the freshwater stingray Potamotrygon scobina in the Amazon basin, Brazil. In April 2018, a specimen of Potamotrygon scobina was collected by bottom long-term using fish as bait ...
Paulo Arthur Abreu Trindade, Felipe Antônio Silva Jr, Marcos Sidney Brito Oliveira, Carson Allen Jeffres, Marcelo Ândrade, Tommaso Giarrizzo   +5 more
doaj   +2 more sources

Foreign stingers: South American freshwater river stingrays Potamotrygon spp. established in Indonesia [PDF]

Scientific Reports, 2023
The pet trade is known to be one of the most important pathways of aquatic non-native species introduction and Indonesia is a significant trade partner. Popular ornamental South American river stingrays (Potamotrygon spp.) were introduced to Indonesia in
Rikho Jerikho, Surya Gentha Akmal, Veryl Hasan, Yonvitner, Jindřich Novák, André Lincoln Barroso Magalhães, Alberto Maceda-Veiga, Michael F. Tlusty, Andrew L. Rhyne, Ondřej Slavík, Jiří Patoka   +10 more
doaj   +2 more sources

Testicular Morphology and Spermatogenesis in Potamotrygon motoro: Insights Into Reproduction of Freshwater Stingrays [PDF]

Journal of Morphology, Volume 287, Issue 2, February 2026.
Electron microscopy of Potamotrygon motoro spermatozoa. a – Illustration of a schematic sperm cell depicting the helical head, intermediate piece (midpiece), and flagellum. b ‐ Helical heads (Hh) of spermatozoa inserted into the cytoplasm of Sertoli cells (S) through openings in the plasma membrane. Scales: 10 μm.
Maria Luiza Ribeiro Delgado, Patricia Postingel Quirino, Luciane Gomes‐Silva, Viktoriya Dzyuba, Borys Dzyuba, Alexandre Ninhaus‐Silveira, Rosicleire Veríssimo‐Silveira   +6 more
wiley   +2 more sources

Branchial localization of acid (A‐type) and base (B‐type) excreting ionocytes in Amazonian stenohaline freshwater Potamotrygon ray [PDF]

Journal of Fish Biology, Volume 108, Issue 3, Page 922-931, March 2026.
Abstract The branchial epithelium of Potamotrygon—a member of the only strictly freshwater elasmobranch family Potamotrygonidae—was observed via immunohistochemistry, and two distinct forms of ionocytes were identified. The acid (A‐type) and base (B‐type) secreting cells with respective basolateral–apical localizations of Na+/K+‐ATPase–Na+/H+ exchanger
M. W. Rossi, C. M. Wood, A. L. Val, J. M. Wilson   +3 more
wiley   +2 more sources

Karyotypic variation of two populations of the small freshwater stingray Potamotrygon wallacei Carvalho, Rosa & Araújo 2016: A classical and molecular approach. [PDF]

PLoS ONE, 2023
Potamotrygoninae comprises a group of Neotropical fishes with an ancient relationship with marine environments. In the last few years, 11 new Potamotrygon species were described, including Potamotrygon wallacei Carvalho, Araújo e Rosa 2016.
Alex M V Ferreira, Patrik F Viana, Leandro Marajó, Eliana Feldberg   +3 more
doaj   +2 more sources

Linking rivers, mixing faunas: How artificial connectivity between the Middle and Upper Paraná River basins shapes fish diversity in a tributary of the Itaipu Reservoir, Brazil [PDF]

Journal of Fish Biology, Volume 108, Issue 2, Page 648-668, February 2026.
Abstract This work aimed to investigate the distribution and occurrence of fish species along the São Francisco Falso Braço Norte (SFFBN) River basin, a tributary of the Middle Paraná River basin now artificially connected to the Upper Paraná ecoregion, to evaluate how such connectivity may affect the biogeographic distribution and regional composition
Lucas E. P. Kampfert, João C. Maicrovicz, Daniel R. Blanco, Denise Lange, Carla S. Pavanelli, Heleno Brandão   +5 more
wiley   +2 more sources

Visual discrimination and resolution in freshwater stingrays (Potamotrygon motoro) [PDF]

Journal of Comparative Physiology A, 2020
AbstractPotamotrygon motoro has been shown to use vision to orient in a laboratory setting and has been successfully trained in cognitive behavioral studies using visual stimuli. This study explores P. motoro’s visual discrimination abilities in the context of two-alternative forced-choice experiments, with a focus on shape and contrast, stimulus ...
Martha M. M. Daniel, Laura Alvermann, Imke Böök, Vera Schluessel   +3 more
openaire   +3 more sources

Morphological, cytochemical and ultrastructural aspects of blood cells in freshwater stingray species in the middle Rio Negro basin of Amazonian Brazil [PDF]

Scientific Reports, 2021
In the present work, we examined the morphology, dimensions, cytochemical staining reactions and ultrastructure of blood cells from three freshwater stingray species, Potamotrygon wallacei, Potamotrygon motoro and Paratrygon aiereba, living in the waters
Adriano Teixeira de Oliveira, Jefferson Raphael Gonzaga de Lemos, Marcio Quara de Carvalho Santos, Jackson Pantoja-Lima, Paulo Henrique Rocha Aride, Maria Lúcia Góes de Araújo, Marcos Tavares-Dias, Jaydione Luiz Marcon   +7 more
doaj   +2 more sources

3D Electron Microscopy Reveals the Structural Complexity of the Intravacuolar Membranous Network in Cyrilia lignieresi‐Infected Erythrocytes of the Fish Synbranchus marmoratus [PDF]

Journal of Eukaryotic Microbiology, Volume 72, Issue 4, July/August 2025.
ABSTRACT This study employs advanced three‐dimensional electron microscopy techniques, including Transmission Electron Microscopy (TEM) tomography and freeze‐fracture imaging via scanning electron microscopy (SEM), to investigate the ultrastructural organization of Cyrilia lignieresi‐infected red blood cells (iRBCs) in the host fish Synbranchus ...
Brenda Santarém Fachetti, Maíra Turiel‐Silva, Camila Wendt, Hilton Tulio Costi, Edilene Oliveira da Silva, Ana Paula Drummond Rodrigues, Wanderley de Souza, Kildare Miranda, José Antonio Picanço Diniz   +8 more
wiley   +2 more sources

Diversity and ecological relationships of Cestoda and Monogenoidea parasites of freshwater stingrays (Myliobatiformes, Potamotrygonidae), in the upper Paraná River, Brazil [PDF]

International Journal for Parasitology: Parasites and Wildlife
The Neotropical freshwater stingrays of Potamotrygon genus present a unique and complex natural history and biogeographical pattern that can be traced to a marine origin and the colonization of the continental environment during the Miocene.
Jumma Miranda Araújo Chagas, Douglas de Castro Ribeiro, Thalita Fischer Santini Mendes, Felipe Chinaglia Montefeltro, Luciano Alves dos Anjos   +4 more
doaj   +2 more sources