page_title: Theodoxus
section_title: Description
hierarchical_section_title: Theodoxus / Description
caption_attribution_description: English: One row of teeth in the radula of Theodoxus fluviatilis. Photograph available at http://192.124.245.3/tl_files/bio/ag-benthische-organismen/pdf/zettler_et_al-2004-theodoxus.pdf.
context_page_description: Theodoxus is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.
context_section_description: The shell in this genus is semiovular with a flat apertural plain. There is no umbilicus. The columella and inner whorls are dissolved.
  Species in the genus Theodoxus  are highly variable in size, in color pattern of the periostracum, in details of the operculum and in the radula, and all these factors can make identification to species level very challenging.
caption: Representative row of radula teeth of T. fluviatilis
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