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• W2918943310 abstract "Largely shallow and putatively explosive divergences in the family Leporidae (rabbits and hares; order: Lagomorpha) have resulted in phylogenetic relationships that remain currently unresolved. These rapid radiations in different branches of the leporid tree have resulted in conflicting phylogenetic hypotheses. However, this phylogenetic incongruence may also result from inadequate taxon or character sampling, due to the high number of extinct and difficult to sample extant species, and highly conserved morphological characters. Sylvilagus (cottontail rabbits) constitute about 30% of the known extant leporid species. New species are routinely being recognized, and phylogenetic relationships with respect to other leporid genera, and within the genus, have failed to be recovered with certainty. Within Sylvilagus, the South American S. brasiliensis is the most widespread and poorly known taxon, likely comprising multiple species. Here, we reanalyze previously published molecular data from phylogenetic studies on Leporidae, focusing on the S. brasiliensis group, and assessing phylogenetic relationships using bifurcating trees and split networks to identify phylogenetic regions with polytomies. We estimate differentiation and phylogenetic relationships of molecular lineages within the S. brasiliensis group. Our analyses suggest that this group contains a number of divergent taxa, well differentiated from other cottontail species. We discern two major polytomies during leporid diversification. The first, at the base of the leporid radiation, likely resulted from a combination of hard (rapid radiation) and soft polytomies (high number of unsampled extinct species). The second polytomy likely resulted from a rapid radiation during the initial diversification of the genus Sylvilagus. We conclude that only a molecular phylogeny based on a broader taxonomic representation will fully resolve leporid phylogeny. Divergências recentes, e provavelmente explosivas, na família de mamíferos Leporidae (coelhos e lebres; ordem: Lagomorpha) resultaram em relações filogenéticas ainda por resolver. Rápidas radiações em diferentes ramos da árvore dos leporídeos têm originado hipóteses filogenéticas conflitantes. Contudo, a incongruência filogenética pode ser resultado de amostragem taxonômica ou de caracteres inadequadas, devido a um alto número de taxa extintos e de espécies viventes difíceis de amostrar, ou a caracteres morfológicos bastante conservados. O gênero Sylvilagus (coelhos americanos) compreende cerca de 30% das espécies de leporídeos viventes. Novas espécies de Sylvilagus estão continuamente sendo descritas e, nem as relações filogenéticas com outros gêneros de leporídeos, nem as relações dentro do próprio gênero foram ainda recuperadas com certeza. Dentro de Sylvilagus, o táxon sul americano S. brasiliensis é o mais amplamente distribuído e menos conhecido, provavelmente incluindo múltiplas espécies. Neste trabalho, examinamos hipóteses filogenéticas moleculares previamente publicadas para Leporidae, expandindo a representação taxonômica do grupo S. brasiliensis e verificando as relações filogenéticas usando árvores bifurcadas e redes filogenéticas para identificar regiões de politomia. Nós estimamos a diferenciação e relações filogenéticas das linhagens moleculares dentro do grupo S. brasiliensis. As nossas análises sugerem que o grupo de espécies S. brasiliensis contém taxa bem divergentes das outras espécies do gênero. Além disso, observamos duas politomias principais ocorridas durante a diversificação dos leporídeos. A primeira, na base da sua radiação, provavelmente resultou da combinação de rápida radiação e elevado número de espécies extintas não amostradas. A segunda politomia provavelmente provém da rápida radiação durante a fase inicial de diversificação de Sylvilagus. Nós concluímos que apenas filogenias moleculares baseadas numa representação taxonômica mais ampla conseguirão resolver a filogenia dos leporídeos." @default.
• W2918943310 created "2019-03-11" @default.
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• W2918943310 date "2019-02-28" @default.
• W2918943310 modified "2023-09-25" @default.
• W2918943310 title "Illuminating the obscured phylogenetic radiation of South American<i>Sylvilagus</i>Gray, 1867 (Lagomorpha: Leporidae)" @default.
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• W2918943310 doi "https://doi.org/10.1093/jmammal/gyy186" @default.
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