Doodle showing the diatom Plagiogramma Fossil Diatom Atlas
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Medlinia duplicata (Schmidt) Sims (1998)
Liradiscus ovalis Greville (1865)
Lepidodiscus elegans Witt (1886)
Sceptroneis praecaducea Hajós & Stradner (1975)
Pyrgupyxis gracilis (Tempère & Forti) Hendey (1969)
Cylindrospira simsiae Mitlehner (1995)