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Harpoceras (Harpoceras) okadai (Yokoyama) Holotype Hirano, H., 1971 p. 127, pl. 20, fig. 1 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 42. |
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Dactylioceras (Dactylioceras) helianthoides Yokoyama Lectotype Hirano, H., 1971 p. 104, pl. 14, fig. 9 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 42. |
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Dactylioceras (Dactylioceras) helianthoides Yokoyama Paralectotype Hirano, H., 1971 p. 104, pl. 14, fig. 8a, b Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 42. |
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Dactylioceras (Dactylioceras) helianthoides Yokoyama Paralectotype Hirano, H., 1971 p. 104, pl. 14, fig. 10 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 42. |
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