Tooth mineralization and histology patterns in extinct and extant snaggletooth sharks, Hemipristis (Carcharhiniformes, Hemigaleidae)-Evolutionary significance or ecological adaptation?

Shark jaws exhibit teeth that are arranged into distinct series and files and display great diversities Shakes in shapes and structures, which not only is related to their function (grasping, cutting, crushing) during feeding, but also bear a strong phylogenetic signal.So far, most research on the relationship between shark teeth and feeding ecolog

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Molecular phylogeny of the tribe Philodryadini Cope, 1886 (Dipsadidae: Xenodontinae): Rediscovering the diversity of the South American Racers

Abstract South American racers of the tribe Philodryadini are a widespread and diverse group Face Masks of Neotropical snakes with a complex taxonomic and systematic history.Recent studies failed to present a robust phylogenetic hypothesis for the tribe, mainly due to incomplete taxon sampling.Here we provide the most extensive molecular phylogenet

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