{"pk":41600,"title":"New soft-shelled turtles (Plastomeninae, Trionychidae, Testudines) from the Late Cretaceous and Paleocene of North America","subtitle":null,"abstract":"Two new genera (\nDerrisemys\n and \nPlastomenoide\ns) and three new species (\nD. sterea, P. lamberti, P. tetanetron\n) of plastomenine trionychids from Montana and Wyoming are described. They are unique within the Trionychidae in having the entoplastron locked into notches in the hyoplastra and restricting midline kinesis. \nD. sterea \noccurs in the Lancian NALMA (North American Land Mammal Age) of Montana and Wyoming and Puercan NALMA of Montana. \nP. tetanetron\n occurs in the Puercan NALMA of Montana. \nP. lamberti \noccurs\n \nin the Torrejonian NALMA of Montana and Tiffanian NALMA of Wyoming and Utah. \nPlastomenus acupictus\n Hay 1907 from New Mexico is referred to \nDerrisemys\n. The age of \nD. acupictus\n is uncertain but is likely from early Paleocene (Torrejonian NALMA).","language":"en","license":null,"keywords":[{"word":"Trionychid"},{"word":"NALMA"},{"word":"Derrisemys"},{"word":"Plastomenoides"}],"section":"Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/6090612k","frozenauthors":[{"first_name":"J.","middle_name":"Howard","last_name":"Hutchison","name_suffix":"","institution":"University of California, Berkeley","department":"None"}],"date_submitted":"2014-03-18T20:18:34Z","date_accepted":"2014-03-18T20:18:34Z","date_published":"2009-11-05T08:00:00Z","render_galley":null,"galleys":[{"label":"","type":"pdf","path":"https://journalpub.escholarship.org/ucmp_paleobios/article/41600/galley/31142/download/"}]}