Traits taxon details
original description
(of Trigonia umkwelanensis Etheridge, 1904 †) Etheridge, R. Jr. (1904). Cretaceous fossils of Natal, Pt. I, The Umkwelane Hill deposit, Zululand. <em>In: Anderson, W. Second Report of the Geological Survey of Natal and Zululand.</em> London, West, Newman and Co., 69-93. page(s): 75, pl. 1, figs 14-19 [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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