[2] The distribution of the genus Theodoxus includes Europe and northern Africa and also extends east to southern Iran.

[3] Theodoxus needs rough surfaces in order to be able to digest its food, so a stony substrate is necessary.

[4] Bunje (2004) noted at least 34 extant taxa at species level in the genus Theodoxus.

IUCN Red List (2015) provided conservation status for 23 species of Theodoxus.

[6] Species within the genus Theodoxus include: This article incorporates public domain text from the reference [3]