See text Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum.

[2] The family Neritidae includes marine genera such as Nerita, marine and freshwater genera such as Neritina, and freshwater and brackish water genera such as Theodoxus.

The common name "nerite" as well as the family name Neritidae and the genus name Nerita, are derived from the name of Nerites, who was a sea god in Greek mythology.

Neritidae live primarily in the southern hemisphere, but there are some exceptions, such as a genus Theodoxus which can be found in Europe and Northern Africa [3] or Bathynerita naticoidea.

This family consists of the five following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005): Genera, subgenera and species within the family Neritidae include:[5] Subfamily Neritinae Subfamily † Neritariinae Subfamily Neritininae Subfamily Smaragdiinae Subfamily † Velatinae