Results 51 to 60 of about 972 (148)

Gill dimensions in near-term embryos of Amazonian freshwater stingrays (Elasmobranchii: Potamotrygonidae) and their relationship to the lifestyle and habitat of neonatal pups

Neotropical Ichthyology
This comparative study of gill morphometrics in near-term embryos of freshwater stingray potamotrygonids examines gill dimensions in relation to neonatal lifestyle and habitat.
Wallice Paxiúba Duncan, Maria Isabel da Silva, Marisa Narciso Fernandes   +2 more
doaj   +1 more source

Heterogeneidade de hemoglobina nos peixes da Amazonia [PDF]

Acta Amazonica, 1978
Resumo Os padrões eletroforáticos de hemoglobinas de peixes da Amazônia foram descritos. Os peixes incluíram a pirambóia sul-americana, Lepidosiren paradoxa, quatro espécies de raias de água doce do género Potamotrygon e teleósteos sctinopterígeos de 77 ...
Unni E. H. Fyhn, Hans Jorgen Fyhn, Bonnie J. Davis, Dennis A. Powers, William L. Fink, Robert L. Garlick   +5 more
doaj   +1 more source

Potamotrygon motoro gestacion

, 2017
Hembra adulta de potamotrygon motoro en estado de gestaciónFaunaVichadaLaboratorio Fundación OrinoquíaLaboratorio de pecesRaya motoroPotamotrygon motoroAnimaliaChordataChondrichthyesMyliobatiformesPotamotrygonidaePotamotrygonPuerto ...
Novoa Serna, María del Rosario
core   +1 more source

Morfometria de raias continentais (Chondrichthyes, Potamotrygonidae) do alto rio Paraná, Brasil = Morphometry of upper Paraná river freshwater stingrays (Chondrichthyes, Potamotrygonidae)

Acta Scientiarum: Biological Sciences, 2007
Potamotrygonidae constitui o único grupo recente de Chondrichthyes cujo habitat está restrito, exclusivamente, a águas continentais. Na planície de inundação do Alto rio Paraná, espécies desta família estabeleceram-se após o fechamento das comportas da ...
Antonio Guilherme Cândido da Silva, Erivelto Goulart   +1 more
doaj  

Ecotoxicology of Potamotrygoninae freshwater stingrays: bioaccumulation, toxicological risks, and conservation implications

Frontiers in Marine Science
Obligate freshwater stingrays of the Potamotrygoninae subfamily are endemic to South America and confined to freshwater systems heavily impacted by anthropogenic activities. These pressures often lead to habitat degradation, with unknown impacts on these
Neuciane Dias Barbosa, Neuciane Dias Barbosa, Natascha Wosnick, Natascha Wosnick, Natascha Wosnick, Ana Paula Chaves, Eloísa Pinheiro Giareta, Renata Daldin Leite, Patricia Charvet, Rachel Ann Hauser-Davis   +9 more
doaj   +1 more source

Taxonomic and morphological revision of the complex Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

, 2010
A família Potamotrygonidae é um grupo monofilético de raias exclusivo de água doce, ocorrendo na maioria dos grandes rios neotropicais sulamericanos.
João Paulo Capretz Batista da Silva, Silva, João Paulo Capretz Batista da   +1 more
core   +1 more source

Potamotrygon Garman 1877

, 2023
<p> Genus <i>Potamotrygon</i> Garman, 1877</p> <p> TYPE SPECIES. — <i>Trygon histrix</i> Müller & Henle, 1841 (type species by original designation; Garman 1877).</p>Published as part of ...
Aguilera, Orangel, Carrillo-Briceño, Jorge D., Vanegas, Andrés, Hendricks, Kimberly, Mora-Rojas, Laura   +4 more
core   +1 more source

Diet of the freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) on Marajó Island (Pará, Brazil) Dieta da raia de água doce Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) na Ilha de Marajó (Pará, Brasil)

Brazilian Journal of Biology, 2010
The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated.
MP. Almeida, PMO. Lins, P. Charvet-Almeida, RB. Barthem   +3 more
doaj   +1 more source

Fish distribution across altitudinal gradients in the Upper Paraguay River Basin: Implications for conservation in the Pantanal region

Conservation Science and Practice, Volume 7, Issue 7, July 2025.
This paper approaches the patterns in fish distribution across the altitudinal gradient in the Upper Paraguay River basin, from uplands to the floodplain. We compiled more than 75,000 available fish records and registered 342 fish species and your distribution along altitudinal gradient. Floodplain portion have higher species diversity than headwaters,
Adriana Maria Espinoza Fernando, Francisco Severo‐Neto, Fabiane Silva Ferreira, Lúcia Mateus, Karina K. Tondato‐Carvalho, Elaine Antoniassi Luiz Kashiwaqui, Heriberto Gimenes Junior, Wladimir M. Domingues, Carla Simone Pavanelli, Henrique Ledo Lopes Pinho, Jerry Penha, Yzel Rondon Súarez   +11 more
wiley   +1 more source

Características anatômicas do pâncreas em Potamotrygon amandae LOBODA & CARVALHO, 2013

, 2022
A arraia de água doce Potamotrygon amandae, pertence a subclasse dos elasmobrânquios, que se estabeleceu de maneira não natural no alto do Rio Paraná, no município de Ilha Solteira, São Paulo, devido a inundação do salto de Sete Quedas.
Galatti, Isabela
core