Traits taxon details
original description
(of Trigonia clavigera Cragin, 1893 †) Cragin, F. W. (1893). A contribution to the invertebrate paleontology of the Texas Cretaceous. In: Dumble, E.T. (Ed.) Fourth Annual Report of the Geological Survey of Texas. Paleontology and Natural History, 9. Geological Survey of Texas, Austin, pp. 139-295, pls 24-46. [published June 1893]., available online at https://repositories.lib.utexas.edu/handle/2152/77954 page(s): 212, pl. 46, figs 12, 13 [details]
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