Results 21 to 30 of about 3,591 (200)

An unusual, dwarf new species of Neotropical freshwater stingray, Plesiotrygon nana sp. nov., from the upper and mid Amazon basin: the second species of Plesiotrygon (Chondrichthyes: Potamotrygonidae)

Papéis Avulsos de Zoologia, 2011
A new species of the relatively poorly known Neotropical freshwater stingray genus Plesiotrygon Rosa, Castello & Thorson, 1987 is described from the main channel and smaller tributaries (Ríos Itaya and Pachitea) of the upper Amazon basin in Peru.
Marcelo R. de Carvalho, Maíra P. Ragno
doaj   +3 more sources

Sharks and Rays of Northern Australia’s Roper River, with a Range Extension for the Threatened Speartooth Shark Glyphis glyphis [PDF]

Animals
Northern Australia is considered a ‘lifeboat’ region for globally threatened shark and ray species (elasmobranchs), although much of the region is understudied.
Julia M. Constance, Erica A. Garcia, Yugul Mangi Rangers, Christy-Louise Davies, Peter M. Kyne   +4 more
doaj   +2 more sources

Feeding behavior of the Neotropical freshwater stingray Potamotrygon motoro (Elasmobranchii: Potamotrygonidae) [PDF]

Neotropical Ichthyology, 2012
The feeding mechanisms of elasmobranchs and their functioning have been receiving growing scientific attention, although less emphasis has yet to be directed towards batoid species.
Akemi Shibuya, Jansen Zuanon, Sho Tanaka
doaj   +4 more sources

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

Sci Rep, 2023
AbstractThe 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 the 1980s and the culture was established. Here we present a detailed Indonesian market and
Jerikho R, Akmal SG, Hasan V, Yonvitner, Novák J, Magalhães ALB, Maceda-Veiga A, Tlusty MF, Rhyne AL, Slavík O, Patoka J.   +10 more
europepmc   +5 more sources

Hematology and blood biochemistry profile of the freshwater stingray Potamotrygon magdalenae as a tool for population assessment in artificial environments

Brazilian Journal of Biology, 2021
Hematological and blood biochemical reference information is important to establish physiological status of freshwater stingray populations and improve care and management protocols in artificial environments.
J. G. Pérez-Rojas, P. A. Mejía-Falla, A. F. Navia, A. M. Tarazona, S. C. Pardo-Carrasco   +4 more
doaj   +1 more source

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   +2 more sources

Sperm Lipid Composition in Early Diverged Fish Species: Internal vs. External Mode of Fertilization

Biomolecules, 2020
The lipid composition of sperm membranes is crucial for fertilization and differs among species. As the evolution of internal fertilization modes in fishes is not understood, a comparative study of the sperm lipid composition in freshwater ...
Kathrin M. Engel, Viktoriya Dzyuba, Alexandre Ninhaus-Silveira, Rosicleire Veríssimo-Silveira, Dirk Dannenberger, Jürgen Schiller, Christoph Steinbach, Borys Dzyuba   +7 more
doaj   +1 more source

Environmental DNA approach complements social media reports to detect an endangered freshwater stingray species in the wild

Endangered Species Research, 2022
Environmental DNA (eDNA) barcoding has emerged as an important non-invasive sampling technique for the detection of rare and endangered species that can be difficult to sample.
KC Lim, AY Then
doaj   +1 more source

Morphological aspects and germ cells of male reproductive tract of river stingray, Potamotrygon amandae

Acta Scientiarum: Biological Sciences, 2023
The family Potamotrygonidae are the only species of stingrays restricted to fresh water and located exclusively in South America. The objective of this research was to analyze the morphological aspects and germ cells of the male reproductive tract of ...
Stefhani Cristina Chan Jacik, Julia Bastos de Aquino, Luana Felix de Melo, Rosângela Felipe Rodrigues, Alan Peres Feraz de Melo, Maria Angélica Miglino, Rose Eli Grassi Rici   +6 more
doaj   +1 more source

Electroreception in the obligate freshwater stingray, Potamotrygon motoro [PDF]

Marine and Freshwater Research, 2015
Elasmobranch fishes use electroreception to detect electric fields in the environment, particularly minute bioelectric fields of potential prey. A single family of obligate freshwater stingrays, Potamotrygonidae, endemic to the Amazon River, demonstrates morphological adaptations of their electrosensory system due to characteristics of a high impedance
Lindsay L. Harris, Christine N. Bedore, Stephen M. Kajiura   +2 more
openaire   +1 more source