Results 91 to 100 of about 873 (190)

Argulus juparanensis (Branchiura) em raias Potamotrygon spp. (Potamotrygonidae) na foz do rio Amazonas (Brasil). [PDF]

, 2017
Este estudo descreve a ocorrência de Ar gulus juparanensis Lemos de Castro, 1950 (Argulidae) na superfície corporal de P otamotrygon constellata, Potamotrygon dumerilii, P otamotrygon motoro, Potamotrygon orbignyi, P otamotrygon scobina e P otamotrygon ...
FERREIRA SOBRINHO, A., VIEIRA, I. M., GAMA, C. S., SILVA JÚNIOR, A. C., TAVARES-DIAS, M   +4 more
core  

Hematology, biochemical profile and thyroid hormones of four species of freshwater stingrays of the genus Potamotrygon

, 2015
Potamotrygonidae e um grupo de raias endêmicas da América do Sul distribuídas nas principais bacias hidrográficas brasileiras, mas informações sobre suas variáveis hematológicas e bioquímicas são escassas.
Mundim, Antônio Vicente, Moraes, Julieta Rodini Engrácia de, Moraes, Flávio Ruas de, Yunis, Jefferson, Tavares-Dias, Marcos, Claudiano, Gustavo da Silva, Viadanna, Pedro Henrique Oliveira, Brito, Fernando Moraes Machado   +7 more
core   +1 more source

Morphology of lateral line canals in Neotropical freshwater stingrays (Chondrichthyes: Potamotrygonidae) from Negro River, Brazilian Amazon

Neotropical Ichthyology
The relationship between the distribution of the lateral line canals and their functionality has not been well examined in elasmobranchs, especially among Neotropical freshwater stingrays of the family Potamotrygonidae.
Akemi Shibuya, Jansen Zuanon, Maria Lúcia G. de Araújo, Sho Tanaka   +3 more
doaj   +1 more source

Potamotrygon motoro

, 2017
Individuo adulto de potamotrygon motoroFaunaVichadaLaboratorio Fundación OrinoquíaLaboratorio de pecesRaya motoroPotamotrygon motoroAnimaliaChordataChondrichthyesMyliobatiformesPotamotrygonidaePotamotrygonPuerto ...
Novoa Serna, María del Rosario
core  

FIGURE 24 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)

, 2016
FIGURE 24. Morphological details of Potamotrygon leopoldi (MZUSP 35986). A) Lower jaw region showing both angular cartilages; B) Close-up of multiple rows of closely-packed dorsal tail thorns; C) Tail region showing distribution of dorsal tail thorns ...
MARCELO R. DE CARVALHO, De Carvalho, Marcelo R.   +1 more
core   +1 more source

Activity and habitat use of two species of stingrays (Myliobatiformes: Potamotrygonidae) in the upper Paraná River basin, Southeastern Brazil

Neotropical Ichthyology
The life history of freshwater stingrays (Potamotrygonidae) under natural conditions has been poorly documented. In this study, we investigated theperiod of activity and the habitat use of two species of the genus Potamotrygon in the upper Paraná River ...
Domingos Garrone Neto, Virgínia Sanches Uieda   +1 more
doaj   +1 more source

Ergasilus trygonophilus sp. nov. (Copepoda: Ergasilidae) a branchial parasite of freshwater stingrays (Potamotrygonidae) from state of Pará, Brazil

Zoologia (Curitiba), 2010
Ergasilus trygonophilus sp. nov. is described from freshwater stingrays (Potamotrygon spp. and Plesiotrygon iwamae Rosa, Castello & Thorson, 1987) from the state of Pará, Brazil.
Marcus V. Domingues, Taísa M. Marques
doaj   +1 more source

Potamotrygon motoro morfometria

, 2017
toma de parametros morfométricos a potamotrygon motoroFaunaVichadaLaboratorio Fundación OrinoquíaLaboratorio de pecesRaya motoroPotamotrygon motoroAnimaliaChordataChondrichthyesMyliobatiformesPotamotrygonidaePotamotrygonPuerto ...
Novoa Serna, María del Rosario
core  

RECTAL GLAND OF FRESHWATER STINGRAYS,POTAMOTRYGONSPP. (CHONDRICHTHYES:POTAMOTRYGONIDAE)

The Biological Bulletin, 1978
1. Contrary to some reports, a rectal gland is present in strictly freshwater stingrays of South American rivers (Potamotrygon spp.). 2. The gland has the location and histological features of the salt-secreting rectal gland of marine elasmobranchs, but is much reduced in size and number of tubules. 3. Its residual function, if any, is unknown. 4.
Thorson, Thomas B., Wotton, Robert M, Georgi, Todd A   +2 more
openaire   +4 more sources

Behavioural assessment of Potamotrygon stingrays under different food enrichment strategies

Frontiers in Ethology
IntroductionFreshwater stingrays of the genus Potamotrygon are endemic to South America and increasingly maintained in aquaria worldwide, yet welfare studies on these species remain limited.
Cassia Regina Ramos Gonzaga, Cristiano Schetini de Azevedo, Helen Colbachini, Laura Chrispim Reisfeld, Fabiana Lúcia André Padilha, Rafael Caprioli Gutierrez, Cristiane Schilbach Pizzutto, Cristiane Schilbach Pizzutto   +7 more
doaj   +1 more source