Consulta: creatorFacets:"Laurin, M."
Registros recuperados: 5
Data/hora: 09/06/2024 18:04:09

Triadobatrachus massinoti, the earliest known lissamphibian (Vertebrata: Tetrapoda) re-examined by μCT scan, and the evolution of trunk length in batrachians
Provedor de dados: 16
Autores: Ascarrunz, E.; Rage , J.-C.; Legreneur, P.; Laurin, M.
Triadobatrachus massinoti is a batrachian known from a single fossil from the Early Triassic of Madagascar that presents a combination of apomorphic salientian and plesiomorphic batrachian characters. Herein we offer a revised description of the specimen based on X-ray micro-tomography data. We report previously unknown caudal vertebrae, possible mentomeckelians, and hidden parts of other structures. We also confirm the presence of a ventrolateral ledge on the opisthotic, and we rectify some previous interpretations. There are no cervical ribs and the jaw may have had an angular. The presacral region is composed of 15 vertebrae with a unique atlas-axis complex instead of 14 vertebrae with a bipartite atlas. The configuration of the pelvic girdle is not...
Tipo: Article / Letter to the editor
Palavras-chave: Anura; Caudopelvic apparatus; CT scan; Salientia; Triassic; Trunk evolution; 42.82.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/610011

The subjective nature of Linnaean categories and its impact in evolutionary biology and biodiversity studies
Provedor de dados: 16
Autores: Laurin, M.
Absolute (Linnaean) ranks are essential to rank-based nomenclature (RN), which has been used by the vast majority of systematists for the last 150 years. They are widely recognized as being subjective among taxonomists, but not necessarily in other fields. For this reason, phylogenetic nomenclature (PN) and other alternative nomenclatural systems have been developed. However, reluctance to accept alternative nomenclatural systems and continued use of higher taxa of a given Linnaean category in comparative analyses presumably reflect a lack of appreciation of the deleterious effects of the subjective nature of Linnaean categories in other biological fields, such as conservation and evolutionary biology. To make that point clearer, evolutionary models under...
Tipo: Article / Letter to the editor
Palavras-chave: Biological nomenclature; Codes of nomenclature; Comparative biology; Evolution; PhyloCode; Phylogenetic; Nomenclature; 42.21.
Ano: 2010
URL: http://www.repository.naturalis.nl/record/361032

A reevaluation of the evidence supporting an unorthodox hypothesis on the origin of extant amphibians
Provedor de dados: 16
Autores: 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

Evolution of species-specific major seminal fluid proteins in placental mammals by gene death and positive selection
Provedor de dados: 16
Autores: Meslin, C.; Laurin, M.; Callebaut, I.; Druart, X.; Monget, P.
The seminal fluid is a complex substance composed of a variety of secreted proteins and has been shown to play an important role in the fertilisation process in mammals and also in Drosophila. Several genes under positive selection have been documented in some rodents and primates. Our study documents this phenomenon in several other mammalian taxa. We study the evolution of genes that encode for 20 proteins that are quantitatively predominant in the seminal fluid of at least one out of seven domestic animal species. We analyse the amino acid composition of these proteins for positive selection and for the presence of pseudogenes. Genes that disappeared through pseudogenisation include KLK2 in cattle, horse and mice. Traces of positive selection are found...
Tipo: Article / Letter to the editor
Palavras-chave: Molecular evolution; Multivariate phylogenetic pairwise comparisons; Reproductive isolation; Speciation; Comparative biology; Pseudogenisation; 42.64; 42.13; 42.70.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/575180

Experimental systematics: sensitivity of cladistic methods to polarization and character ordering schemes
Provedor de dados: 16
Autores: Rineau, V.; Grand, A.; Zaragüeta, R.; Laurin, M.
Phenotypic characters are essential to study the evolution of extant and extinct life forms and to reconstruct the tree of life. Inside the cladistics theory, parsimony is used by a large majority of systematists working on phenotypic characters, whereas 3ta is much less widespread but has triggered important debates. Many important differences in the interpretation of the cladistic theory exist between these methods, e.g. meaning and treatment of reversals, character representation as ‘data-matrices’ in parsimony (ordered and unordered), and as rooted trees (hierarchies) in 3ta. Although 3ta has received severe criticism, mostly focused in the use of software intended to be used in parsimony, only a few empirical studies have compared these methods so...
Tipo: Article / Letter to the editor
Palavras-chave: Branch length; Evolutionary model; Hierarchy; Ordered characters; Outgroup polarization; Parsimony; Reversals; Three-taxon analysis; Three-taxon statements; Unordered characters; 42.10.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/560429