Robuta

https://diatoms.org/species/49111/aneumastus_minor?x-craft-preview=cab8b13ef68d1e257235fd2491770f51dfe0c9a6c0ad3b95411776e5316d603alxhbyabypv Aneumastus minor | Species - Diatoms of North America north americaaneumastusminorspeciesdiatoms