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Registros recuperados: 7
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A reevaluation of the evidence supporting an unorthodox hypothesis on the origin of extant amphibians Naturalis
Marjanovic, D.; Laurin, M..
The origin of frogs, salamanders and caecilians is controversial. McGowan published an original hypothesis on lissamphibian origins in 2002 (McGowan, 2002, Zoological Journal of the Linnean Society, 135: 1-32), stating that Gymnophiona was nested inside the 'microsaurian' lepospondyls, this clade was the sister-group of a caudate-salientian-albanerpetontid clade, and both were nested inside the dissorophoid temnospondyls. We have investigated McGowan's data matrix and isagree with the scoring of 35% of the cells. All taxa and all but two characters are affected. In some cases, we have a different interpretation about correspondence between morphology and character states, or we delimit states differently (or use information that was unknown in 2002). In...
Tipo: Article / Letter to the editor Palavras-chave: Albanerpetontidae; Brachydectes; Coding; Continuous characters; Data matrix; Gerobatrachus; Gymnophioniformes; Gymnophionomorpha; Lissamphibia; Lysorophia; Morphology; Ontogeny; Paleontology; Phylogeny; Scoring; Stepmatrix gap-weighting; 42.82.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/289109
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A review of the systematic biology of fossil and living bony-tongue fishes, Osteoglossomorpha (Actinopterygii: Teleostei) Neotropical Ichthyology
Hilton,Eric J.; Lavoué,Sébastien.
ABSTRACT The bony-tongue fishes, Osteoglossomorpha, have been the focus of a great deal of morphological, systematic, and evolutionary study, due in part to their basal position among extant teleostean fishes. This group includes the mooneyes (Hiodontidae), knifefishes (Notopteridae), the abu (Gymnarchidae), elephantfishes (Mormyridae), arawanas and pirarucu (Osteoglossidae), and the African butterfly fish (Pantodontidae). This morphologically heterogeneous group also has a long and diverse fossil record, including taxa from all continents and both freshwater and marine deposits. The phylogenetic relationships among most extant osteoglossomorph families are widely agreed upon. However, there is still much to discover about the systematic biology of these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biogeography; Osteoglossidae; Paleontology; Phylogeny; Taxonomy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000300304
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Age Prediction in the Adult Based on the Pulp-to-Tooth Ratio in Lower Third Molars: A Cone-beam CT Study International Journal of Morphology
Alsoleihat,Firas; Al-Shayyab,Mohammad H; Kalbouneh,Heba; Al-Zer,Heba; Ryalat,Soukaina; Alhadidi,Abeer; Saoud,Hamza; Shaweesh,Ashraf I; Al-Omoush,Salah A; Khraisat,Ameen.
Estimation of age-at-death is an integral part of the identification process of individuals in many forensic odontology cases where their identity cannot be determined by visualization or other ways. Dental age estimation in the adult is more challenging as most of the dentition is completely developed by 18 years of age. This study employs a mesio-distal (MD) pulp-to-tooth ratio taken at the neck of lower third molars (LM3) to provide an estimation of age at the time of radiographic imaging based on the well-known fact that pulp volume tends to decrease with advancing age due to continued apposition of secondary dentine throughout adulthood. A total of 155 Cone-beam computed tomography (CBCT) radiographs of LM3s for a random sample of 155 Jordanian Arabs...
Tipo: Journal article Palavras-chave: Estimation of age-at-death; Forensic odontology; Archaeology; Paleontology; Dental age estimation; Third molars.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200017
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Brachyplatystom a promagdalena, new species, a fossil goliath catfish (Siluriformes: Pimelodidae) from the Miocene of Colombia, South America Neotropical Ichthyology
Lundberg,John G..
A fossil Weberian complex of a large pimelodid catfish from the middle Miocene La Venta fauna of central Colombia originally identified as Brachyplatystoma sp. is described as a new, extinct species. Brachyplatystoma promagdalena, new species, is diagnosed by three autapomorphic characters: fifth centrum with a massive midventral expansion containing deep cavities and heavy ridges; first and compound centra contribute to a pair of prominent anterolateral processes before the ventral ends of the ossa suspensoria; and compound centrum with an anteriorly concave low ridge crossing its ventral surface posterior to aortic canal foramen. Brachyplatystoma promagdalena is compared to modern congeneric species and placed in the subgenus Malacobagrus with B....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malacobagrus; Weberian vertebrae; Paleontology; La Venta fauna; Villavieja Formation.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000400017
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Brief review of dinosaur studies and perspectives in Brazil Anais da ABC (AABC)
KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A..
Dinosaur research is developing at very high rates around the world resulting in several new discoveries that are improving our understanding of this terrestrial reptilian clade. Except for the last couple years, the studies of Brazilian dinosaurs have not followed this expansive trend, despite the high potential of several dinosaur localities. So far there are only eight described taxa, four in the last year, representing theropod, sauropod, and one possible prosauropod taxa. Except for footprints, there are no records of ornithischian dinosaurs in the country what is at least partially explainable by the lack of continuous vertebrate fossil collecting program in the country. More funding is necessary to improve the research activities in this field.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paleontology; Dinosauria; Brazil.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400005
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Fossil record of Pomacea (Caenogastropoda: Ampullariidae) in Argentina and its paleoenvironmental implications Biocell
Martín,Pablo R.; de Francesco,Claudio G..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apple snails; Distribution; Paleontology; Paleoecology; Paleoclimate.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000200011
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THE FOSSIL RECORD OF TURTLES IN COLOMBIA; A REVIEW OF THE DISCOVERIES, RESEARCH AND FUTURE CHALLENGES Acta biol.Colomb.
CADENA,EDWIN A.
This is a review article on the fossil record of turtles in Colombia that includes: the early Cretaceous turtles from Zapatoca and Villa de Leyva localities; the giant turtles from the Paleocene Cerrejón and Calenturitas Coal Mines; the early Miocene, earliest record of Chelus from Pubenza, Cundinamarca; the early to late Miocene large podocnemids, chelids and testudinids from Castilletes, Alta Guajira and La Venta; and the small late Pleistocene kinosternids from Pubenza, Cundinamarca. I also discuss here the current gaps in the fossil record of tropical South American turtles, as well as the ongoing research and future projects to be developed in order to understand better the evolutionary history of Colombian turtles.
Tipo: Journal article Palavras-chave: Colombia; Cryptodires; Paleontology; Pleurodires; Testudines.
Ano: 2014 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000300001
Registros recuperados: 7
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