Traits taxon details
original description
(of Trigonia churchi F. M. Anderson, 1958 †) Anderson, F. M. 1958. Upper Cretaceous of the Pacific Coast. The Geological Society of America, Memoir 71, 1-378. page(s): 115, pl. 17, figs 6, 7 [details] Available for editors 
original description
(of Trigonia evansana Meek, 1858 †) Meek, F. B. (1858). Descriptions of new organic remains from the Cretaceous rocks of Vancouver's Island. <em>Transactions of the Albany Institute.</em> 4: 37-49., available online at https://www.biodiversitylibrary.org/page/43715497 page(s): 42 [details]
original description
(of Trigonia inezana E. L. Packard, 1921 †) Packard, E. L. (1921). The Trigoniae from the Pacific coast of North America. <em>University of Oregon Publication.</em> 1: 1-59. page(s): 27, pl. 8, fig. 1, pl. 9, fig. 1, pl. 10, fig. 1 [details]
basis of record
Cooper, M. R. (2015). On the Pterotrigoniidae (Bivalvia, Trigoniida): their biogeography, evolution, classification and relationships. <em>Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen.</em> 277(1): 11-42., available online at https://doi.org/10.1127/njgpa/2015/0488 [details] Available for editors 
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