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