Traits taxon details
original description
(of Trigonia branneri 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): 112, pl. 17, fig. 5 [details] Available for editors 
original description
(of Trigonia fitchi 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): 20, pl. 6, fig. 3, pl. 7, fig. 2 [details]
basis of record
Cooper, M. R. & Leanza, H. A. (2017). On the Steinmanellidae (Bivalvia: Myophorelloidea); their palaeo-biogeography, evolution and classification. <em>Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen.</em> 285 (3): 313-335., available online at https://doi.org/10.1127/njgpa/2017/0683 [details] Available for editors 
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