Photograph: (Jung, 1989, Fig. 290.2-3) SEM image of NMB H17264. NMB locality 17449: La Bomba, Río Banano, Limón Province, Costa Rica; Río Banano fm. 1. protoconch with its sinusigerous outer lip and first teleoconch whorl, outer lip not well preserved; scale=6 mm; 2. apical view, scale=5 mm.
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