{"pk":41739,"title":"Checklist of California Paleogene–Neogene marine Mollusca since Keen and Bentson (1944)","subtitle":null,"abstract":"This checklist is a sequel to the one published by A. Myra Keen and Herdis Bentson in 1944 and is an alphabetical listing of California marine Paleogene–Neogene mollusk species or subspecies described and/or figured in the published literature spanning the interval of 1944 through 2020. The original data are given for each species and subspecies of bivalves, gastropods, chitons (polyplacophorans), scaphopods, and cephalopods. Where detected, formation names, ages, taxonomy, systematics, and specimen disposition were corrected. A total of 559 genera and 1,698 species/subspecies were tabulated, with the bivalves and gastropods being the most abundant taxa. Bivalve and gastropod diversity steadily built up during the Paleocene, nearly doubled during the Eocene warm time, declined greatly during the cool time of the Oligocene, rebounded to its highest peak in the Miocene and then declined slightly during the Pliocene. The other classes represented only minor faunal components. Chitons were only reported from the Pliocene, and cephalopods had their highest diversity during the Paleocene and Eocene. Bivalve genera having the highest diversity are: \nGlycymeris\n, \nMacoma\n, \nMactromeris\n,\n Nuculana\n, and \nTellina\n. Gastropod genera having the highest diversity are \nCancellaria\n and \nTurritella\n. It is very likely that the \nTurritella\n species/subspecies complex has been significantly overnamed. The high point of research productivity of published reports on California Paleogene-Neogene mollusks was in 1990–1994, and a significant decline occurred in 1995–1996, following the closure of the Menlo Park USGS Paleontology and Stratigraphy facility. An overall decline in productivity has continued, with noticeable upticks in 2003 and in recent years.","language":"en","license":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0","short_name":"CC BY-NC-SA 4.0","text":"<p><!-- x-tinymce/html --></p>\n<p>Readers are free to:</p>\n<ul>\n<li><strong>Share</strong> — copy and redistribute the material in any medium or format</li>\n<li><strong>Adapt</strong> — remix, transform, and build upon the material<br><br>The licensor cannot revoke these freedoms as long as you follow the license terms.</li>\n</ul>\n<p>Under the following terms:</p>\n<ul>\n<li><strong>Attribution</strong> — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.</li>\n<li><strong>NonCommercial</strong> — You may not use the material for commercial purposes .</li>\n<li><strong>ShareAlike</strong> — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.<br><br>No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.</li>\n</ul>\n<p>Notices:</p>\n<p>You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.</p>\n<p>No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.</p>","url":"https://creativecommons.org/licenses/by-nc-sa/4.0"},"keywords":[{"word":"Bivalves, gastropods, chitons, scaphopods, cephalopods, taxonomy, biodiversity, fossil"}],"section":"Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/7t50309r","frozenauthors":[{"first_name":"Lindsey","middle_name":"T.","last_name":"Groves","name_suffix":"","institution":"Natural History Museum of Los Angeles County, Malacology Department, Los Angeles, CA 90007.","department":"None"},{"first_name":"Richard","middle_name":"L.","last_name":"Squires","name_suffix":"","institution":"Professor Emeritus, California State University, Northridge, Department of Geological Sciences, CA; Research Associate, Natural History Museum of Los Angeles County, Invertebrate Paleontology Department, Los Angeles, California, 90007.","department":"None"}],"date_submitted":"2021-02-06T21:42:44-08:00","date_accepted":"2021-02-06T21:42:44-08:00","date_published":"2021-02-06T00:00:00-08:00","render_galley":null,"galleys":[{"label":"","type":"pdf","path":"https://journalpub.escholarship.org/ucmp_paleobios/article/41739/galley/31211/download/"}]}