Results 151 to 160 of about 559 (179)
Some of the next articles are maybe not open access.
The Anatomical Record, 2016
ABSTRACTThe reproductive biology of South American freshwater stingrays (family Potamotrygonidae) is still poorly studied compared to other marine species. In the present study, we examined the gross anatomy and histology of six species of potamotrygonids from the Amazon basin and described the structural asymmetry of the ovaries and their relationship
Maria Isabel, da Silva +3 more
openaire +2 more sources
ABSTRACTThe reproductive biology of South American freshwater stingrays (family Potamotrygonidae) is still poorly studied compared to other marine species. In the present study, we examined the gross anatomy and histology of six species of potamotrygonids from the Amazon basin and described the structural asymmetry of the ovaries and their relationship
Maria Isabel, da Silva +3 more
openaire +2 more sources
Zootaxa, 2015
The Neotropical freshwater stingray Potamotrygom orbignyi (Castelnau, 1855), and other similar "reticulated" species occurring in northern South American basins, were submitted to a thorough taxonomic analysis based on an extensive external and internal morphological study. The identity of P.
João Paulo C B Da, Silva +1 more
openaire +2 more sources
The Neotropical freshwater stingray Potamotrygom orbignyi (Castelnau, 1855), and other similar "reticulated" species occurring in northern South American basins, were submitted to a thorough taxonomic analysis based on an extensive external and internal morphological study. The identity of P.
João Paulo C B Da, Silva +1 more
openaire +2 more sources
Physiological and Biochemical Zoology, 2010
The gill morphologies of six species of potamotrygonid freshwater stingrays from the Amazon basin were investigated using light and electron microscopy. Some unique features were found in the potamotrygonid gill: (1) fingerlike protuberances on the gill filament, (2) an Alcian blue/periodic acid-Schiff-positive histochemical reaction for several cell ...
Wallice Paxiúba, Duncan +3 more
openaire +2 more sources
The gill morphologies of six species of potamotrygonid freshwater stingrays from the Amazon basin were investigated using light and electron microscopy. Some unique features were found in the potamotrygonid gill: (1) fingerlike protuberances on the gill filament, (2) an Alcian blue/periodic acid-Schiff-positive histochemical reaction for several cell ...
Wallice Paxiúba, Duncan +3 more
openaire +2 more sources
Copeia, 1987
A new genus and species of neotropical freshwater stingray are described from the upper and mid-Amazon drainage, in Ecuador and Brazil (Rio Napo and Rio Solimbes). The new taxa are characterized by a long filiform tail, reduced eyes, and low number of pectoral-fin radials.
Ricardo S. Rosa +2 more
openaire +1 more source
A new genus and species of neotropical freshwater stingray are described from the upper and mid-Amazon drainage, in Ecuador and Brazil (Rio Napo and Rio Solimbes). The new taxa are characterized by a long filiform tail, reduced eyes, and low number of pectoral-fin radials.
Ricardo S. Rosa +2 more
openaire +1 more source
Zoomorphology, 2019
The mechanosensory system in batoids has a unique sensory canal distribution located on both dorsal and ventral surfaces of the body. Due to the opposite position of eyes and mouth, ventral lateral-line canals are essential to detect and capture prey buried in the substrate.
Akemi Shibuya +2 more
openaire +2 more sources
The mechanosensory system in batoids has a unique sensory canal distribution located on both dorsal and ventral surfaces of the body. Due to the opposite position of eyes and mouth, ventral lateral-line canals are essential to detect and capture prey buried in the substrate.
Akemi Shibuya +2 more
openaire +2 more sources
Journal of morphology, 2017
Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal base of each clasper.
Paola, Anaya-López +1 more
openaire +1 more source
Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal base of each clasper.
Paola, Anaya-López +1 more
openaire +1 more source
Molecular Biology, 2015
5S rDNA genes of the stingray Potamotrygon motoro were PCR replicated, purified, cloned and sequenced. Two distinct classes of segments of different sizes were obtained. The smallest, with 342 bp units, was classified as class I, and the largest, with 1900 bp units, was designated as class II.
Cruz, V. P., Oliveira, C., Foresti, F.
openaire +3 more sources
5S rDNA genes of the stingray Potamotrygon motoro were PCR replicated, purified, cloned and sequenced. Two distinct classes of segments of different sizes were obtained. The smallest, with 342 bp units, was classified as class I, and the largest, with 1900 bp units, was designated as class II.
Cruz, V. P., Oliveira, C., Foresti, F.
openaire +3 more sources
Journal of Fish Biology, 2019
Abstract Potamotrygon marquesi, sp. nov., is described and compared with other species of Potamotrygon occurring in the Amazon Basin. The identity of this new species is supported by an extensive external and internal morphological study including coloration pattern, squamation, skeleton and ventral lateral‐line canals. Morphometrics and meristics were
João Paulo Capretz Batista da Silva +1 more
openaire +2 more sources
Abstract Potamotrygon marquesi, sp. nov., is described and compared with other species of Potamotrygon occurring in the Amazon Basin. The identity of this new species is supported by an extensive external and internal morphological study including coloration pattern, squamation, skeleton and ventral lateral‐line canals. Morphometrics and meristics were
João Paulo Capretz Batista da Silva +1 more
openaire +2 more sources
Journal of Morphology
ABSTRACT This work aimed to describe and quantify the tissue components of the digestive tube of the neotropical freshwater stingray, Potamotrygon wallacei . For this, conventional histology and stereological methods were used to estimate tissue volume.
Rubia Neris Machado +1 more
openaire +2 more sources
ABSTRACT This work aimed to describe and quantify the tissue components of the digestive tube of the neotropical freshwater stingray, Potamotrygon wallacei . For this, conventional histology and stereological methods were used to estimate tissue volume.
Rubia Neris Machado +1 more
openaire +2 more sources
Journal of morphology, 2015
The purpose of this study was to describe the structure of the reproductive tract of males of Potamotrygon magdalenae before, during, and after they acquire sexual maturity, and to establish the first maturity scale for males within the family Potamotrygonidae. The male reproductive tract of P.
Tania Del Mar, Pedreros-Sierra +1 more
openaire +1 more source
The purpose of this study was to describe the structure of the reproductive tract of males of Potamotrygon magdalenae before, during, and after they acquire sexual maturity, and to establish the first maturity scale for males within the family Potamotrygonidae. The male reproductive tract of P.
Tania Del Mar, Pedreros-Sierra +1 more
openaire +1 more source