Traits taxon details
original description
Arnold, R. (1909). Paleontology of the Coalinga district, Fresno and Kings counties, California. <em>United States Geological Survey Bulletin.</em> 396: 1-173., available online at https://pubs.usgs.gov/bul/0396/report.pdf page(s): 92-93, pl. 30, fig. 11 [details] 
original description
(of Gonidea coalingensis var. cooperi Arnold, 1909 †) Arnold, R. (1909). Paleontology of the Coalinga district, Fresno and Kings counties, California. <em>United States Geological Survey Bulletin.</em> 396: 1-173., available online at https://pubs.usgs.gov/bul/0396/report.pdf page(s): 93 [details] 
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 67 [details] Available for editors 
additional source
Modell, H. (1957). Die fossilen Najaden Nordamerikas. Ein Klassifizierungsversuch. <em>Archiv für Molluskenkunde.</em> 86(4/6): 183-200. page(s): 195 [details] Available for editors 
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