| Autor: |
Meyer D; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06506520-8109, USA., Brownstein CD; Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520-8106, USA.; Stamford Museum and Nature Center, Stamford, CT 06903, USA., Jenkins KM; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06506520-8109, USA.; Yale Peabody Museum, New Haven, CT 06520-8118, USA., Gauthier JA; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06506520-8109, USA.; Yale Peabody Museum, New Haven, CT 06520-8118, USA. |
| Abstrakt: |
Geckos are a speciose and globally distributed clade of Squamata (lizards, including snakes and amphisbaenians) that are characterized by a host of modifications for nocturnal, scansorial and insectivorous ecologies. They are among the oldest divergences in the lizard crown, so understanding the origin of geckoes ( Gekkota ) is essential to understanding the origin of Squamata , the most species-rich extant tetrapod clade. However, the poor fossil record of gekkotans has obscured the sequence and timing of the assembly of their distinctive morphology. Here, we describe the first North American stem gekkotan based on a three-dimensionally preserved skull from the Morrison Formation of western North America. Despite its Late Jurassic age, the new species already possesses several key characteristics of the gekkotan skull along with retained ancestral features. We show that this new stem gekkotan, and several previously named species of uncertain phylogenetic relationships, comprise a widespread clade of early crown lizards, substantiating faunal homogeneity in Laurasia during the Late Jurassic that extended across disparate ecological, body-size and physiological classes. |
