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| http://dx.doi.org/10.11646/zootaxa.3746.4.7 | DOI Listing |
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- The study aims to clarify the evolutionary relationships of the Orestias genus, previously misclassified under the family Cyprinodontidae due to incomplete data, by using complete genome sequencing.* -
- Researchers sequenced genomes from three Orestias species and created a comprehensive phylogenetic tree, revealing that Orestias is closely related to South American fish rather than distant genera.* -
- Findings indicate that Orestias should be reassigned to its own lineage, closely linked to the Fluviphylacidae family, rather than being grouped with Cyprinodontidae.*
Phylogeography of high Andean killifishes (Teleostei: Cyprinodontidae) in Caquena and Lauca sub-basins of the Altiplano (Chile): mitochondrial and nuclear analysis of an endangered fish.
PeerJ
August 2021
Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Temuco, Región de la Araucanía, Chile.
From the early Miocene, the uplift of the Andes Mountains, intense volcanic activity and the occurrence of successive periods of dryness and humidity would have differentially influenced the modification of Altiplano watersheds, and consequently the evolutionary history of the taxa that live there. We analyzed populations from the Caquena and Lauca Altiplanic sub-basins of northern Chile to determine their genetic differentiation and relationship to their geographical distribution using mitochondrial (D-loop) and nuclear (microsatellite) molecular markers and to reconstruct its biogeographic history on these sub-basins. The results allowed reconstructing and reevaluating the evolutionary history of the genus in the area; genic diversity and differentiation together with different founding genetic groups suggest that have been spread homogeneously in the study area and would have experienced local disturbances that promoted isolation and diversification in restricted zones of their distribution.
View Article and Find Full Text PDFFirst record sheds light on the distribution of the cyprinodontiform genus Jenynsia (Günther, 1866) in the High Andean Plateau.
J Fish Biol
November 2020
Centro Ictiológico Andino, Facultad Ciencias Exactas y Naturales, Universidad Nacional Catamarca, Catamarca, Argentina.
This is the first record of the genus Jenynsia in the High Andean Plateau (HAP). It has been found at elevations between 3400 and 3900 m in three endorreheic systems: Salar Antofalla, Antofagasta de la Sierra and El Peñón, northwestern Argentina, South America. This finding increases the number of known HAP fish genera to five.
View Article and Find Full Text PDFChromosomal organization of four classes of repetitive DNA sequences in killifish Parenti, 1984 (Cyprinodontiformes, Cyprinodontidae).
Comp Cytogenet
July 2017
Facultad de Medicina, Universidad de Chile, ICBM, Programa de Genética Humana, Casilla 70061, Santiago, Chile.
Valenciennes, 1839 is a genus of freshwater fish endemic to the South American Altiplano. Cytogenetic studies of these species have focused on conventional karyotyping. The aim of this study was to use classical and molecular cytogenetic methods to identify the constitutive heterochromatin distribution and chromosome organization of four classes of repetitive DNA sequences (histone H3 DNA, U2 snRNA, 18S rDNA and 5S rDNA) in the chromosomes of Parenti, 1984, an endemic species restricted to the Salar de Ascotán in the Chilean Altiplano.
View Article and Find Full Text PDFMorphological and taxonomic descriptions of a new genus and species of killifishes (Teleostei: Cyprinodontiformes) from the high Andes of northern Chile.
PLoS One
October 2017
Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.
A new genus and species, Pseudorestias lirimensis, is described from the southern part of the Chilean Altiplano. While sharing several characters that clearly align the new species with Orestias, this new fish is characterized by numerous autapomorphies: the Meckel cartilage is a continuous cartilage that broadly expands posteriorly (in large specimens, it keeps its anterior part and is resorbed posteriorly), the basibranchials are fused into one long element, the second pharyngobranchial is not displaced dorsally over pharyngobranchial tooth plate 3+4, but they are aligned, the anterior and posterior ceratohyals are closely articulated keeping a scarce amount of cartilage between both bones and ventral to them, ossified middle and distal dorsal radials are present in females as well as ossified middle and distal anal radials. Pseudorestias lirimensis presents strong sexual dimorphism associated to size.
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