Doodle showing the diatom Plagiogramma Fossil Diatom Atlas
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Sceptroneis praecaducea Hajós & Stradner (1975)
Stictodiscus novaezealandiae Grunow (1888)
Eupodiscus radiatus Bailey (1851)
Triceratium lineatum Greville (1863)
Horodiscus rugosus Hajós (1975)