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Siphonacmea angustitesta (Yokoyama) Holotype Makiyama, J., 1958 pl. 46, fig. 10 Cenozoic | Mollusca : Gastropoda : Siphonariidae Material Reports, no. 9, p. 53. |
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Siphonacmea oblongata (Yokoyama) Syntype Makiyama, J., 1958 pl. 46, fig. 14 Cenozoic | Mollusca : Gastropoda : Siphonariidae Material Reports, no. 9, p. 53. |
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