Results 191 to 200 of about 2,449 (227)

Integrative taxonomy reveals a new species of the glass knifefish genus Eigenmannia Jordan & Evermann, 1896 (Teleostei: Gymnotiformes: Sternopygidae) from the Rio Branco basin, Brazil.

Journal of Fish Biology
A new species of Eigenmannia is described from the Rio Branco basin, Roraima, Brazil, based on morphological and molecular datasets. It is distinguished from all congeners by the following combination of characters: lateral line stripe extending from ...
G. Dutra, L. Peixoto, L. M. Donin, C. D. de Santana, N. Menezes   +4 more
semanticscholar   +1 more source

Sexual Dimorphism in Apteronotus Bonapartii (Gymnotiformes: Apteronotidae)

Copeia, 2006
Here we document sexual dimorphism in both external measurements of the head and discrete features of the skull in Apteronotus bonapartii. To quantify morphological variation in A. bonapartii, ten external morphometric measurements were taken from the head and body of 58 individuals.
Hilton, Eric J., Fernandes, Cristina Cox
openaire   +1 more source

Hidden Diversity in Eigenmannia (Gymnotiformes: Sternopygidae) Populations from Upper Paraná and Paraguay Rivers

Zebrafish
Eigenmannia is a highly diverse genus within the Sternopygidae family, comprising 30 species. Due to its complex taxonomy, molecular analyses have been crucial for species delimitation within this group.
Raissa Caroline Mazetto, L. I. Ramos, Margarida Maria de Rossi Vieira, F. R. Carvalho, Luciana Andréia Borin de Carvalho, A. V. de Oliveira, Carlos Alexandre Fernandes, Ana Luiza de Brito Portela Castro   +7 more
semanticscholar   +1 more source

Efferent projections of the posterior lateral line lobe in gymnotiform fish

Journal of Comparative Neurology, 1982
AbstractThe posterior lateral line lobe (PLLL) of gymnotoid fish has efferent projections to two midbrain regions: the nucleus praeeminentialis dorsalis (n.P.d.) and the torus semicircularis dorsalis (T.Sd.). Both ipsilateral and contralateral connections are present; the n.P.d. receives nearly equal input from both sides while the T.Sd.
L, Maler, E, Sas, C E, Carr, J, Matsubara   +3 more
openaire   +4 more sources

Catecholaminergic systems in the brain of a gymnotiform teleost fish: An immunohistochemical study

Journal of Comparative Neurology, 1990
AbstractThe localization of catecholamines (CA) in the brain of Apteronotus leptorhynchus was studied with immunohistochemical techniques using antibodies to the enzymes tyrosine hydroxylase (TH), dopamine B‐hydroxylase (DBH), phenylethanolamine‐N‐methyltransferase (PNMT), and the neurotransmitter dopamine (DA).
E, Sas, L, Maler, B, Tinner
openaire   +2 more sources

Characterization of the electrosensory organs in Gymnotus carapo (Teleostei: Gymnotiformes): Morphological and immunohistochemical analysis.

The Anatomical Record
Gymnotiformes are weakly electric fishes that rely on specialized electrosensory organs for navigation, prey detection, and electrocommunication in structurally complex aquatic environments.
T. B. Cohene, Gabriela Olea, Franco González, Eduen Gross, Federico Benitez, Claucia Aparecida Honorato, C. Quintana   +6 more
semanticscholar   +1 more source

Connections of the olfactory bulb in the gymnotiform fish, Apteronotus leptorhynchus

Journal of Comparative Neurology, 1993
AbstractThis work examines the connectivity of the olfactory bulb in the gymnotiform fish Apteronotus leptorhynchus. Wheat germ agglutinin conjugated horseradish peroxidase was iontophoresed in different areas and depths of the bulb in order to define its efferent and afferent connections.
E, Sas, L, Maler, M, Weld
openaire   +2 more sources

Robotic device shows lack of momentum enhancement for gymnotiform swimmers

Bioinspiration & Biomimetics, 2019
Many fish generate thrust by undulating one or multiple elongated fins while keeping their body straight. This propulsion mechanism has stimulated interest in both biology and bio-inspired marine propulsion because its maneuverability and efficiency at low speed.
Ian English, Hanlin Liu, Oscar M Curet
openaire   +2 more sources

Organization of the Digestive Tract and Localization of Protein Fibre in Electrophorus sp. (Gymnotiformes: Gymnotidae)

Acta Zoologica
Research into the electric eel ( Electrophorus ) has focused on its production of high‐voltage electrical discharges for predation and defence, and its divergence from other fish species in terms of molecular activities.
Sinlapachai Senarat, N. Thaochan, Kitiya Kongthong, Eiichi Hondo, Wirayatida Bubphasook, Ayako Matsumoto, Peerapon Sornying, P. Boonyoung, A. Iida   +8 more
semanticscholar   +1 more source

Neurogenesis, cell death and regeneration in the adult gymnotiform brain

Journal of Experimental Biology, 1999
ABSTRACT Gymnotiform fish, like all teleosts examined thus far, are distinguished by their enormous potential for the production of new neurons in the adult brain. In Apteronotus leptorhynchus, on average 105 cells, corresponding to approximately 0.2 % of the total population of cells in the adult brain, are in S-phase within any period ...
openaire   +2 more sources