"Crocodylus" acer

Extinct species of reptile "Crocodylus" acer Eocene, 56 53 Crocodylus acer.jpg 0.8 "Crocodylus" acer "Crocodylus" acerCope, 1882 "Crocodylus" acer is an extinct species of crocodyloid from the Eocene of Utah. A single well preserved skull was described by paleontologist Edward Drinker Cope in 1882 and remains the only known fossil of the species. It was found from the Wasatchian-age Green River Formation. "C." acer had a long, narrow snout and a low, flattened skull.Mook C.C. 1921 The skull of Crocodilus acer Cope Bulletin of the American Museum of Natural History 44 11 117–121 https://digitallibrary.amnh.org/items/6ec0d5e0-a9a4-4a55-9a40-0df5176cd781 Some postcranial bones have been attributed to "C." acer but they have more recently been suggested to belong to the related species "C." affinis.Brochu C. A. 2000 Phylogenetic relationships and divergence timing of Crocodylus based on morphology and the fossil record Copeia 2000 3 657–673 10.1643/0045-8511(2000)000[0657:pradto]2.0.co;2 Although they were first placed in the genus Crocodylus, "C." acer and "C." affinis are not crown crocodiles. Recent studies place them as early members of Crocodyloidea, only distantly related to Crocodylus. Although it represents a distinct genus, a generic name has not yet been proposed for "C." acer. Phylogeny A 2018 tip dating study by Lee & Yates simultaneously using morphological, molecular (DNA sequencing), and stratigraphic (fossil age) data established the inter-relationships within Crocodilia,Michael S. Y. Lee Adam M. Yates 27 June 2018 Tip-dating and homoplasy: reconciling the shallow molecular divergences of modern gharials with their long fossil Proceedings of the Royal Society B 285 1881 10.1098/rspb.2018.1071 30051855 6030529 free which was expanded upon in 2021 by Hekkala et al. using paleogenomics by extracting DNA from the extinct Voay.Hekkala E. Gatesy J. Narechania A. Meredith R. Russello M. Aardema M. L. Jensen E. Montanari S. Brochu C. Norell M. Amato G. 2021-04-27 Paleogenomics illuminates the evolutionary history of the extinct Holocene "horned" crocodile of Madagascar, Voay robustus Communications Biology en 4 1 505 10.1038/s42003-021-02017-0 33907305 8079395 2399-3642 free The below cladogram shows the results of the latest studies, which placed "C." acer outside of Crocodyloidea, as more basal than Longirostres (the combined group of crocodiles and gavialids). font-size:85%;line-height:85% Crocodylia Alligatoroidea 100 px Prodiplocynodon Asiatosuchus germanicus "Crocodylus" affinis "Crocodylus" depressifrons "Crocodylus" acer Brachyuranochampsa Mekosuchinae Longirostres Crocodyloidea "Crocodylus" megarhinus Crocodylidae 90 px Gavialoidea extinct basal Gavialoids Gavialidae Gavialis 110 px Tomistoma 90 px References B. Q5187410 Category:Crocodilia Category:Eocene crocodylomorphs Category:Eocene reptiles of North America Category:Fossil taxa described in 1882 Category:Taxa named by Edward Drinker Cope Category:Articles with quotation marks in the title Category:Green River Formation