Photograph: (Jung, 1989, Fig. 292.2,4) SEM image of NMB H17266. NMB locality 17445: Río Banano, Limón Province, Costa Rica; type locality of Río Banano fm. 1. protoconch with its sinusigerous outer lip and first teleoconch whorl, scale=6 mm; 2. apical view, scale=5 mm.
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