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4 resultados encontrados para: TEMA: Lacantunia enigmatica
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1.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

The Lacantun Catfish, Lacantunia enigmatica, is reported for the first time in the Usumacinta river basin in Guatemala. Two specimens were collected in the Usumacinta tributaries Río La Pasión and Río Negro, which are characterized by seasonally fast-flowing deep channels and high fluctuations in water-level. We present a map with new records, and a brief description, and images of the specimens collected.


2.
Artículo
Discovery of African roots for the Mesoamerican Chiapas catfish, Lacantunia enigmatica, requires an ancient intercontinental passage
Lundberg, John G. ; Sullivan, John P. (coaut.) ; Rodiles Hernández, María del Rocío (coaut.) (1956-) ; Hendrickson, Dean A. (coaut.) ;
Contenido en: Proceedings of the Academy of Natural Sciences of Philadelphia Vol. 156, no. 1 (September 2007), p. 39-53 ISSN: 0097-3157
Resumen en: Inglés |
Resumen en inglés

Mesoamerica is famous for its complex biota assembled from diverse sources. The recent discovery of a highly distinct freshwater catfish, Lacantunia enigmatica (Lacantuniidae), in Chiapas, México, added an unresolved taxon to this biogeographic puzzle. Morphology has not resolved the relationships of Lacantunia among the >3000 species of Siluriformes. We added Lacantunia to an expanding phylogenetic study of family-level taxa of living catfishes using >3.6 kilobases of nuclear DNA. We find that Lacantunia is derived from within a multi–family clade of African freshwater catfishes. Without living or fossil intermediates marking a wider lacantuniid distribution, this is an extraordinary case of biogeographic disjunction. Continental clades distributed in the New and Old World tropics are often explained by vicariance of Gondwanan ancestors of deep Mesozoic age. However, our fossil-calibrated, relaxed-clock molecular analyses estimate lacantuniid divergence between 75 to 94 mya, after separation of Africa and South America. During Late Cretaceous and early Tertiary, warm conditions and North Atlantic and Beringian land bridges provided migration routes for numerous warm-adapted taxa between the Old World and North America. In mid-Eocene, freshening of warm surface waters of the Arctic and adjacent oceans may have facilitated the intercontinental dispersion of non-marine organisms. These northern pathways are novel predictive hypotheses for explaining disjunct distributions of tropical freshwater fishes such as the relictually endemic Lacantunia and its African sister clade.


3.
- Artículo de divulgación
*En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal, SIBE-Tapachula, SIBE-Villahermosa
Descubren una nueva familia de peces
Duhne Backhauss, Martha (autora) ;
Contenido en: ECOfronteras No. 25 (agosto 2005), p. 25-26 ISSN: 2007-4549
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SIBE Campeche
39773-40 (Disponible)
Disponibles para prestamo: 1
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SIBE Chetumal
39773-20 (Disponible)
Disponibles para prestamo: 1
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SIBE San Cristóbal
B8414 (Disponible)
Disponibles para prestamo: 1
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SIBE Tapachula
39773-30 (Disponible)
Disponibles para prestamo: 1
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SIBE Villahermosa
39773-50 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal, SIBE-Tapachula, SIBE-Villahermosa
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4.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Lacantunia enigmatica (Teleostei: Siluriformes) a new andphylogenetically puzzling freshwater fish from Mesoamerica
Rodiles Hernández, María del Rocío (1956-) ; Hendrickson, Dean A. (coaut.) ; Lundberg, John G. (coaut.) ; Humphries, Julian M. (coaut.) ;
Contenido en: Zootaxa No. 1000 (May 2005), p. 1–24 ISSN: 1175-5326
Nota: Solicítelo con su bibliotecario/a
Resumen en español

Se describe una nueva familia (Lacantuniidae), género y especie de bagre, Lacantunia enigmatica, proveniente de la cuenca del río Usumacinta, Chiapas, México. Cinco estructuras autapomórficas y anatómicamente complejas diagnostican a este especial siluriforme. El quinto (último) hueso infraorbital es relativamente largo, convexo anteriormente y remoto de un proceso esfenótico prominente. Los márgenes laterales del frontal, del etmoide lateral y del esfenótico son gruesos en los orígenes de los músculos adductor mandibulae y levator arcus palatini y la bóveda craneana es plana y estrecha. Un par de huesos “pseudofaringobranquiales” en forma de cono se encuentra en los extremos anteriores de cartílagos mediales agrandados del primer epibranquial. Del tercer epibranquial surge dorsalmente un proceso uncinado hipertrofiado en forma de hacha. La vejiga natatoria tiene un par de divertículos esféricos prominentes no encapsulados que surgen de la pared anterodorsal. Lacantunia enigmatica no puede ser ubicada dentro o como un descendiente basal hermano de ninguna familia o clado multifamiliar conocido excepto Siluroidei. Esta especie podría representar un grupo ancestral quizás del Terciario temprano o más antiguo y se agrega otra interrogante biogeográfica a la biota Mesoamericana históricamente compleja.

Resumen en inglés

A new family (Lacantuniidae), genus and species of catfish, Lacantunia enigmatica, is described from the R o Usumacinta basin of Chiapas, M xico. This odd siluriform is diagnosed by five distinctively autapomorphic and anatomically complex structures. The fifth (last) infraorbital bone is relatively large, anteriorly convex and remote from a prominent sphenotic process. The lateral margin of the frontal, lateral ethmoid and sphenotic bones are thick at the origins of much enlarged adductor mandibulae and levator arcus palatini muscles; otherwise the skull roof is constricted and flat. One pair of cone-shaped "pseudo-pharyngobranchial" bones is present at the anterior tips of enlarged cartilages medial to the first epibranchial. A hypertrophied, axe-shaped uncinate process emerges dorsally from the third epibranchial. The gas bladder has paired spherical, unencapsulated diverticulae protruding from its anterodorsal wall. Lacantunia enigmatica cannot be placed within or as a basal sister lineage to any known catfish family or multifamily clade except Siluroidei. This species may represent an ancient group, perhaps of early Tertiary age or older, and it adds another biogeographic puzzle to the historically complex Mesoamerican biota.