page_title: Limnoscelis
section_title: Discovery and naming
hierarchical_section_title: Limnoscelis / Discovery and naming
caption_attribution_description: English: Limnoscelis skeleton from Sea Reptiles of past and present Latina: Limnoscelis Русский: Скелет лимносцелиса
context_page_description: Limnoscelis was a genus of large diadectomorph tetrapods from the Late Carboniferous of western North America. It includes two species: the type species Limnoscelis paludis from New Mexico, and Limnoscelis dynatis from Colorado, both of which are thought to have lived concurrently. No specimens of Limnoscelis are known from outside of North America. Limnoscelis was carnivorous, and likely semiaquatic, though it may have spent a significant portion of its life on land. Limnoscelis had a combination of derived amphibian and primitive reptilian features, and its placement relative to Amniota has significant implications regarding the origins of the first amniotes.
context_section_description: The type species Limnoscelis paludis was collected by the fossil hunter David Baldwin between 1877 and 1880 from the El Cobre Canyon beds of the Cutler Formation, New Mexico. Baldwin was collecting fossils in service of the paleontologist Othniel Charles Marsh during the bone wars. Although Marsh would describe several specimens from Baldwin’s collections, many fossils, including Limnoscelis paludis, would be deposited without description at the Peabody Museum of Natural History at Yale College for several decades.
  Limnoscelis paludis was finally described in 1911 by the paleontologist Samuel Wendell Williston, who discovered three specimens of the genus in the Yale Peabody Museum collections. These included one relatively complete articulated specimen which included the skull (the holotype, YPM 811), and two less-complete post-cranial skeletons (MCZ 1947 and MCZ 1948, formerly YPM 819 and YPM 809 respectively). Williston named the fossil Limnoscelis paludis, referencing the marsh-like environment that he hypothesized Limnoscelis might have inhabited. In 1912, Williston described the discovery of an additional specimen, collected by himself at the same locality as the previous specimens.
  More Limnoscelis fossils were collected between 1966 and 1973 by the paleontologist Peter P. Vaughn from the Sangre de Cristo Formation in Colorado, which would later be attributed to the species Limnoscelis dynatis. Vaughn, however, did not initially recognize these materials as belonging to Limnoscelis, instead attributing several fossil elements to the Rhachitomi or the Anthracosauria. The presence of Limnoscelis at the locality was finally recognized upon the collection of more fossils from the genus, which would amount to three disarticulated specimens (the holotype CM 47653, and paratypes CM 47651 and CM 47652). These fossils, particularly the holotype, were referenced as representing the genus Limnoscelis in several publications. However, the fossils themselves were not recognized as their own species until paleontologists David S. Berman and Stuart S. Sumida described the fossils in 1990. They designated the new species as Limnoscelis dynatis, with “dynatis” being derived from the Greek “dynatos” meaning “strong” or “powerful”, referencing the genus’ capability as a “formidable predator”.
caption: Skeletal diagram of the L. paludis holotype from 1911
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