Robuta

https://diatoms.org/citations/kociolek_jp_and_rosen_bh-1984-observations_on_north_american_gomphoneis_bac Kociolek and Rosen 1984 - Observations on North American Gomphoneis (Bacillariophyceae) I. Valve... north american kociolek rosen observations gomphoneis