| 31. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Potamididae has no subfamilies.
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| 32. | This family has no subfamilies ( according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 ).
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| 33. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Melanopsidae has no subfamilies.
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| 34. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Moitessieriidae has no subfamilies.
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| 35. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Batillariidae has no subfamilies.
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| 36. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Brachytrematidae has no subfamilies.
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| 37. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Metacerithiidae has no subfamilies.
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| 38. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Prostyliferidae has no subfamilies.
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| 39. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Propupaspiridae has no subfamilies.
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| 40. | According to the taxonomy of the Gastropoda by Bouchet & Rocroi ( 2005 ) the family Canterburyellidae has no subfamilies.
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