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6 results for “lepidosaurs”
The Jurassic rise of squamates as supported by lepidosaur disparity and evolutionary rates
<p>The squamates (lizards, snakes, and relatives) today comprise more than 10,000 species, and yet their sister group, the Rhynchocephalia, is represented by a single species today, the tuatara. The explosion in squamate diversity has been tracked back to the Cretaceous Terrestrial Revolution, 100 million years ago (Ma), the time when flowering plants began their takeover of terrestrial ecosystems, associated with diversification of coevolving insects and insect-eating predators such as lizards, birds, and mammals. Squamates arose much earlier, but their long pre-Cretaceous history of some 150 million years (Myr) is documented by sparse fossils. Here, we provide evidence for an initial radiation of squamate morphology in the Middle and Late Jurassic (174–145 Ma), and show that they established their key ecological roles much earlier than had been assumed, and they have not changed them much since.</p>
The Jurassic rise of squamates as supported by lepidosaur disparity and evolutionary rates
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Data from: Slow and fast evolutionary rates in the history of lepidosaurs
<p>Biodiversity today is uneven, with equally ancient sister groups containing few or many species. It has often been assumed that high biodiversity indicates fast evolution, and yet in a classic work in 1944 George Simpson suggested that fast evolution might generate instability and extinction, and that slow evolution led to high biodiversity. Here we show that evolutionary rates can vary substantially through the history of a clade and find evidence for Simpson's claim. In a comparative phylogenetic study deploying Bayesian methods, we find that Squamata, comprising today over 10,000 species of lizards and snakes, showed slow rates of evolution in the first two-thirds of their history, whereas their sister clade, Rhynchocephalia, comprising just one living species, showed high rates of evolution in the past. Slow and steady won the race for the Mesozoic squamates, and the high-rate boom and bust existence of rhynchocephalians at that time leaves them with a single survivor. We need to explore other cases where fast evolution can lead to short-term high diversification, but in the end long-term low biodiversity.</p>
Data from: Slow and fast evolutionary rates in the history of lepidosaurs
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Data from: Evidence for clinging arboreality in a Middle Jurassic stem lepidosaur
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New sphenodontian (Reptilia: Lepidosauria) from a novel Late Triassic palaeobiota in western North America sheds light on the earliest radiation of herbivorous lepidosaurs
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.