@article{martín_negrete_2007,  title={Radular ultrastructure of South American Ampullariidae (Gastropoda: Prosobranchia)},  volume={67},  ISSN={1519-6984},  url={https://doi.org/10.1590/S1519-69842007000400019},  DOI={10.1590/S1519-69842007000400019},  number={4},  journal={Brazilian Journal of Biology},  publisher={Instituto Internacional de Ecologia},  author={Martín, SM and Negrete, LHL},  year={2007},  month={Nov},  pages={721–726} }