Neritimorpha
The Neritimorpha include the Neritoidea, Neritopsoidea, Platyceratoidea and Hydrocenoidea. Common characteristics are good preservation of highly variable color paterns, a protoconch consisting of aragonite and a teleconch consisting of calcite. In many species the larva is marine but the adults live in freshwater. Few species are completely adapted to living in freshwater conditions.
Neritopsoidea
Theodoxus
- representative of the Paratethys
- habitat: rivers, brackish water
- salinity: 2 - 15 ‰ but lives mainly in freshwater
- no larval stadium because they would be swept away by currents in rivers
- no connection to the ocean necessary
- protoconch spheroidal
- marine
- whorls partially dissolved thus no columella visible
- few terrestrial species
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