Results 141 to 150 of about 1,538 (201)

Exceptional concentration of fish diversity in Yasuní National Park, Ecuador (Napo River Basin). [PDF]

Biodivers Data J
Escobar-Camacho D, Valdiviezo-Rivera J, Carrillo-Moreno C, Argüello P, Swing K.   +4 more
europepmc   +1 more source

A systematic review of reports on aquatic envenomation: are there global hot spots and vulnerable populations? [PDF]

J Venom Anim Toxins Incl Trop Dis
Kadler R, Pirkle C, Yanagihara A.
europepmc   +1 more source

The incomparable fascination of comparative physiology: 40 years with animals in the field and laboratory. [PDF]

J Comp Physiol A Neuroethol Sens Neural Behav Physiol
Bleckmann H.
europepmc   +1 more source

Proposal of Troglocephalinae n. subfam. (Monogenea: Monocotylidae) to accommodate existing and two new monocotylids from the gills of rhinopristiform shovelnose rays. [PDF]

Syst Parasitol
Vaughan DB, Hansen H, Chisholm LA.
europepmc   +1 more source

Testicular Morphology and Spermatogenesis in Potamotrygon motoro: Insights Into Reproduction of Freshwater Stingrays [PDF]

Journal of Morphology, Volume 287, Issue 2, February 2026.
This study investigated the spermatogenesis of the freshwater stingray Potamotrygon motoro using microscopic analyses. The testes of this species were described as being composed of germinal zones, a degenerated zone, and the epigonal organ, consisting ...
M. Delgado, Patricia Postingel Quirino, Luciane Gomes‐Silva, V. Dzyuba, B. Dzyuba, A. Ninhaus‐Silveira, R. Veríssimo‐Silveira   +6 more
semanticscholar   +3 more sources

Distribution modelling for Neotropical freshwater stingrays Potamotrygon brachyura and Potamotrygon motoro (Myliobatiformes, Potamotrygonidae) in the Uruguay River basin.

Journal of Fish Biology, EarlyView.
This study aimed to identify geographical distribution patterns of the giant short-tailed river stingray Potamotrygon brachyura and the motoro stingray Potamotrygon motoro in the Uruguay River basin.
Danilo Araujo Soares Pereira, Roberto E. Reis, N. Fontoura   +2 more
semanticscholar   +3 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 ...
V. Dzyuba, S. Sampels, A. Ninhaus‐Silveira, M. Kahanec, R. Veríssimo‐Silveira, M. Rodina, J. Cosson, S. Boryshpolets, M. Selinger, J. Štěrba, B. Dzyuba   +10 more
semanticscholar   +5 more sources

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

Journal of Experimental Biology, 2019
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.
J. Laurence-Chasen, Jason B. Ramsay, E. Brainerd   +2 more
semanticscholar   +3 more sources

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Potamotrygon motoro stingray venom induces both neurogenic and inflammatory pain behavior in rodents

Toxicon, 2018
&NA; Freshwater stingray accidents cause an immediate, intense, and unrelieved pain which is followed by edema, erythema and necrosis formation.
Louise F Kimura, Louise F Kimura, M. Santos-Neto, Katia C. Barbaro, G. Picolo   +4 more
semanticscholar   +3 more sources

Chromosomal and molecular perspectives on Potamotrygon motoro (Müller & Henle, 1841) from central Amazon.

Genome
Cytogenetic studies on Potamotrygon motoro (Müller & Henle, 1841) are limited to classical cytogenetic techniques, but they do reveal great karyotypic variation.
A. M. Ferreira, P. Viana, Leandro Marajó, Eliana Feldberg   +3 more
semanticscholar   +3 more sources