Traits name details
original description
(of Gonaxis (Marconia) costata Verdcourt, 1963 †) Verdcourt, B. (1963). The Miocene non-marine Mollusca of Rusinga Island, Lake Victoria, and other localities in Kenya. <em>Palaeontographica Abt. A.</em> 121: 1-37. page(s): 24, fig. 46 [details] Available for editors 
basis of record
Pickford, M. (2019). Land Snails from the Early Miocene Legetet Formation, Koru, Kenya. <em>Münchner Geowissenschaftliche Abhandlungen, Reihe A: Geologie und Paläontologie.</em> 49: 1-70. [details] Available for editors 
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