Results 91 to 100 of about 559 (179)

Four new species of neotropical freshwater stingrays of the genus Paratrygon (Myliobatiformes: Potamotrygonidae) from clear water rivers of the Amazon basin

Neotropical Ichthyology
The second most diverse genus of the Potamotrygonidae, Paratrygon, with three previously recognized species, P. aiereba, P. orinocensis and P. parvaspina, is here expanded, with the description of four new species, each endemic to one of the four largest
Thiago Silva Loboda
doaj   +1 more source

Clasper, Clasper Gland, Histology, Potamotrygonidae, Secretory Activity.

, 2016
Se determinó la morfología externa e interna de las glándulas de clásper y su relación con la adquisición de madurez reproductiva en una serie de individuos machos de diferentes estadios (embriones, neonatos, juveniles y adultos activos y en reposo ...
Anaya Lopez, Yenith Paola
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

Broad but restricted detection of malacosporeans in a Neotropical cradle of diversification. [PDF]

Parasitology, 2021
Naldoni J, Okamura B, Hartikainen H, Corrêa LL, Adriano EA.   +4 more
europepmc   +1 more source

Effective Pre-Clinical Treatment of Fish Envenoming with Polyclonal Antiserum. [PDF]

Int J Mol Sci, 2023
Lopes Ferreira M, Falcão MAP, Bruni FM, Haddad V, Marques EE, Seibert CS, Lima C.   +6 more
europepmc   +1 more source

Insectivory in Potamotrygon signata (Chondrichthyes: Potamotrygonidae), an endemic freshwater stingray from the Parnaíba River basin, northeastern Brazil

Brazilian Journal of Biology
Potamotrygon signata is an endemic freshwater stingray species in the Parnaíba River basin, Brazil. After its original description, only citations in systematic lists were recorded in the literature and the biology of the species remains unknown ...
G. Moro, P. Charvet, RS. Rosa
doaj   +1 more source

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

Sci Rep, 2023
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   +1 more source

Morfologia funcional dos mecanismos de alimentação em raias Myliobatoidei, com ênfase em espécies de Potamotrygonidae do médio rio Negro [PDF]

, 2009
Studies on the feeding mechanisms in elasmobranchs have contributed to understand the mechanics of prey capture and processing; however, this kind of information is still scarce for batoids, considered important predators of the benthic fauna.
Shibuya, Akemi
core  

Fig. 6 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

, 2011
Fig. 6. Somatic metaphases of Potamotrygon aff. motoro, the population of Porto Rico (a), population of Ilha Solteira (b), identification of constitutive heterochromatin. Metaphases of Potamotrygon falkneri sample from Porto Rico (c) and Ilha Solteira (d)
Oliveira, Claudio, Shimabukuro-Dias, Cristiane Kioko, Cruz, Vanessa Paes da, Foresti, Fausto   +3 more
core   +1 more source

Alimentação de Potamotrygon signata e Potamotrygon orbignyi (Chondrichthyes: potamotrygonidae) na bacia do rio Parnaíba. [PDF]

, 2010
A avaliação da dieta, baseada na análise de conteúdo estomacal, já se tornou uma prática rotineira no estudo de ecologia de peixes. A família Potamotrygonidae, representada por todas as raias de água doce Neotropicais, é considerada a única família dos ...
Moro, Guilherme
core