Results 21 to 30 of about 2,449 (227)

Chromosome Painting in Gymnotus carapo "Catalão" (Gymnotiformes, Teleostei): Dynamics of Chromosomal Rearrangements in Cryptic Species. [PDF]

Front Genet, 2022
The genus Gymnotus is a large monophyletic group of freshwater weakly-electric fishes, with wide distribution in Central and South America. It has 46 valid species divided into six subgenera (Gymnotus, Tijax, Tigre, Lamontianus, Tigrinus and Pantherus ...
Machado MA, da Silva M, Feldberg E, O'Brien PCM, Ferguson-Smith MA, Pieczarka JC, Nagamachi CY.   +6 more
europepmc   +2 more sources

Cytogenetic characterization of the strongly electric Amazonian eel, Electrophorus electricus (Teleostei, Gymnotiformes), from the Brazilian rivers Amazon and Araguaia [PDF]

Genetics and Molecular Biology, 2008
A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented.
Soraia B.A. Fonteles, Carlos E. Lopes, Alberto Akama, Flora M.C. Fernandes, Fábio Porto-Foresti, José A. Senhorini, Maria de Fátima Z. Daniel-Silva, Fausto Foresti, Lurdes Foresti de Almeida-Toledo   +8 more
doaj   +2 more sources

Spermatic cell characteristics in Gymnotiformes (Teleostei: Ostariophysi) and their phylogenetic meaning

Journal of Fish Biology, 2009
Spermatic characteristics were studied in representatives of the families Rhamphichthyidae, Sternopygidae and Apteronotidae, and compared with pre‐existent data from Gymnotidae and Hypopomidae. The spermatic characteristics found in Gymnotiformes were also compared with data from other Ostariophysi spermatic cells.
Franca, G. F., Oliveira, C., Quagio-Grassiotto, I.   +2 more
core   +6 more sources

Bioecology of Electric Fish (Actinopterygii: Gymnotiformes)

Middle East Research Journal of Biological Sciences
The poraquê has an elongated and cylindrical body, with just one anal fin, which extends across almost the entire abdomen it resembles the shape of an eel. Its head is flat and its mouth is equipped with a row of sharp, conical teeth.
C. Marchiori, Marco Vinícios de Oliveira Santana, Klebert de Paula Malheiros   +2 more
semanticscholar   +2 more sources

Three new species of the Eigenmannia trilineata species group (Gymnotiformes: Sternopygidae) from northwestern South America [PDF]

Neotropical Ichthyology, 2020
Eigenmannia is one of the more taxonomically complex genera within the Gymnotiformes. Here we adopt an integrative taxonomic approach, combining osteology, COI gene sequences, and geometric morphometrics to describe three new species belonging to the E ...
Edgar Esteban Herrera-Collazos, Aleidy M. Galindo-Cuervo, Javier A. Maldonado-Ocampo, Melissa Rincón-Sandoval   +3 more
doaj   +2 more sources

Mitochondrial genomes of the South American electric knifefishes (Order Gymnotiformes)

Mitochondrial DNA Part B, 2016
Three complete mitochondrial genomes of South American electric fishes (Gymnotiformes), derived from high-throughput RNA sequencing (RNA-Seq), are reported herein. We report the complete mitochondrial genome of the bluntnose knifefish Brachyhypopomus n.sp. VERD, determined from newly sequenced data.
Elbassiouny, Ahmed A., Schott, Ryan K., Waddell, Joseph C., Kolmann, Matthew A., Lehmberg, Emma S., Van Nynatten, Alexander, Crampton, William G. R., Chang, Belinda S. W., Lovejoy, Nathan R.   +8 more
openaire   +4 more sources

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types

Neotropical Ichthyology, 2017
A list of all valid names of species of Neotropical electric fishes (Gymnotiformes) is presented herein. The list is arranged by family and genus and includes all available synonyms.
C David de Santana, Richard P Vari, Carl J Ferraris   +2 more
exaly   +3 more sources

Feeding ecology of an Amazonian electric knifefish under altered flood-pulse dynamics caused by hydroelectric damming. [PDF]

J Fish Biol
Abstract This study evaluated the effects of the controlled flood pulse on diet composition, trophic niche breadth and feeding intensity of Archolaemus janeae, an electric knifefish species with a restricted distribution in the Amazon Basin. Monthly samples were collected from December 2020 to November 2021 in the Volta Grande stretch of the Xingu ...
Costa AFVNM, Jardim AA, Prata EG, Gusmão RR, Faro Júnior AJ, Fonseca AS, Hashiguti DT, Montag LFA, Freitas TMS.   +8 more
europepmc   +2 more sources

Description of Encephalon Morphology of Nile Tilapia Oreochromis niloticus (Linnaeus, 1758) (Perciformes: Cichlidae) From Brazil. [PDF]

Anat Histol Embryol
ABSTRACT The Nile tilapia (Oreochromis niloticus) is a cichlid species native to Africa and is widely farmed in tropical and subtropical regions around the world, making it one of the most commercially important aquaculture species. Despite its significance, there is still a lack of detailed anatomical descriptions of its brain.
Pereira ALS, Sartori E, Campos GM, Ferreira CD, Mendonça PP, Vergilio CDS.   +5 more
europepmc   +2 more sources

Sperm ultrastructure in three different families of weakly electric fishes (Teleostei: Gymnotiformes) [PDF]

Neotropical Ichthyology, 2011
This study presents details of sperm ultrastructure for Gymnotus aff. carapo (Gymnotidae), Eigenmannia trilineata (Sternopygidae), and three Brachyhypopomus species (B. draco, B. bombilla, and B. gauderio - Hypopomidae) from southern Brazil.
Júlia Giora, John R. Burns
doaj   +3 more sources