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.
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.
page(s): 93 [details]
original description
(of Margaritana subangulata J. G. Cooper, 1894 †) Cooper, J.G. (1894). On some Pliocene fresh water fossils of California. <em>Proceedings of the California Academy of Sciences, second series.</em> 4: 166-172., available online at https://www.biodiversitylibrary.org/page/16063639
page(s): 166-167, pl. 14, figs 1-4 [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 [request]
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 [request]
From editor or global species database
Type locality USGS loc. 4739, 1 mile northwest of Anderson well, 25 miles south of Coalinga, SE. 1/4 sec. 10, T. 23 S., R. 17 E., Coalinga district, California, USA; basal Tulare Fm., Pliocene [details]