| 21. | ""'Calliostoma amamiense " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 22. | ""'Calliostoma angolense " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 23. | ""'Calliostoma antipodense " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 24. | ""'Calliostoma aporia " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 25. | ""'Calliostoma aprosceptum " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 26. | ""'Calliostoma arx " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 27. | ""'Calliostoma aupourianum " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 28. | ""'Calliostoma babelicum " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 29. | ""'Calliostoma barbouri " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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| 30. | ""'Calliostoma belauense " "'is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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