Results 51 to 60 of about 889 (175)

Descriptions of two new freshwater Neotropical species of Rhinebothrium (Cestoda: Rhinebothriidea) from Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) [PDF]

Folia Parasitologica, 2011
Two new species of Rhinebothrium (Cestoda, Rhinebothriidea) from potamotrygonid stingrays in the Neotropical region are herein described, which raises the total number of Rhinebothrium species known from Neotropical freshwaters to five. Rhinebothrium corbatai sp. n., and Rhinebothrium mistyae sp. n.
Menoret, A., Ivanov, V.A.
openaire   +5 more sources

Diversidad gen?tica de potamotrygon motoro en las cuencas del Onrin?co y Amazonas colombiano [PDF]

, 2017
61 p. Recurso Electr?nicoLa falta de claridad frente a la taxonom?a de Potamotrygon motoro y la ausencia de estudios previos de su diversidad gen?tica, hace a la especie vulnerable al ser la segunda especie de raya de agua dulce m?s extra?da y exportada ...
Renza Mill?n, Mariana
core  

Contrasting patterns of individual specialization and trophic coupling in two marine apex predators [PDF]

, 2010
1. Apex predators are often assumed to be dietary generalists and, by feeding on prey from multiple basal nutrient sources, serve to couple discrete food webs. But there is increasing evidence that individual level dietary specialization may be common in
Heithaus, Michael R., Layman, Craig A., Matich, Philip   +2 more
core   +1 more source

Beyond mammals: the evolution of chewing and other forms of oropharyngeal food processing in vertebrates

Biological Reviews, Volume 101, Issue 3, Page 1406-1462, June 2026.
ABSTRACT Oropharyngeal food processing exhibits a remarkable diversity among vertebrates, reflecting the evolution of specialised ‘processing centres’ associated with the mandibular, hyoid, and branchial arches. Although studies have detailed various food‐processing strategies and mechanisms across vertebrates, a coherent and comprehensive terminology ...
Daniel Schwarz, Maja Mielke, Stephan Handschuh, Anthony Herrel, Patrick Lemell, Léa Da Cunha, Nicolai Konow   +6 more
wiley   +1 more source

Shearing overbite and asymmetrical jaw motions facilitate food breakdown in a freshwater stingray, Potamotrygon motoro [PDF]

Journal of Experimental Biology, 2019
ABSTRACT Many species of fish process their prey with cyclic jaw motions that grossly resemble those seen in mammalian mastication, despite starkly different tooth and jaw morphologies. The degree of similarity between the processing behaviors of these disparate taxa has implications for our understanding of convergence in vertebrate ...
J. D. Laurence-Chasen, Jason B. Ramsay, Elizabeth L. Brainerd   +2 more
openaire   +2 more sources

Ecophysiological interactions and water-related physicochemical parameters among freshwater stingrays

Brazilian Journal of Biology
The objective of this study was to compare and correlate the ecology of neonates and young individuals of Potamotrygon wallacei, Potamotrygon motoro and Paratrygon aiereba with regard to their hematological profile and the physicochemical parameters of ...
A. T. Oliveira, M. L. G. Araújo, J. R. G. Lemos, M. Q. C. Santos, J. Pantoja-Lima, P. H. R. Aride, M. Tavares-Dias, J. L. Marcon   +7 more
doaj   +1 more source

A systematic revision of the South American freshwater stingrays (chondrichthyes: potamotrygonidae) (batoidei, myliobatiformes, phylogeny, biogeography) [PDF]

, 1985
Three genera are recognized in the family Potamotrygonidae of neotropical freshwater stingrays: Potamotrygon, Paratrygon, and Plesiotrygon, the latter being described as a new genus.
Rosa, Ricardo de Souza
core   +2 more sources

Sperm motility and lipid composition in internally fertilizing ocellate river stingray Potamotrygon motoro

Theriogenology, 2019
All extant groups of Elasmobranches have internal fertilization and the structure of the male reproductive organs is very specific: sperm passes from the internal organs via the cloaca, but the male copulating organ (clasper) is distant from the cloaca. This suggests that sperm can contact the surrounding medium before fertilization.
Dzyuba, Viktoriya, Sampels, Sabine, Ninhaus-Silveira, Alexandre, Kahanec, Martin, Verissimo-Silveira, Rosicleire, Rodina, Marek, Cosson, Jacky, Boryshpolets, Sergii, Selinger, Martin, Sterba, Jan, Dzyuba, Borys   +10 more
openaire   +4 more sources

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

Neotropical Ichthyology
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 ...
Ricardo S. Rosa, Marcelo R. de Carvalho, Cristiane de Almeida Wanderley   +2 more
doaj   +1 more source

Hematological parameters of three freshwater stingray species (Chondrichthyes: Potamotrygonidae) in the middle Rio Negro, Amazonas state. [PDF]

, 2016
This paper aimed to study and compare the hematology of newborns, young, subadults, adult males, adult females and pregnant females of Potamotrygon wallacei (cururu stingray), Potamotrygon motoro and Paratrygon aiereba. Newborn cururu stingrays had lower
ARAÚJO, M. L. G. de, ARIDE, P. H. R., LEMOS, J. R. G. de, MARCON, J. L., OLIVEIRA, A. T. de, PANTOJA-LIMA, J., SALES, R. S. de A., SANTOS, M. Q. de C., TAVARES-DIAS, M.   +8 more
core   +1 more source