Doodle showing the diatom Plagiogramma Fossil Diatom Atlas
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Triceratium trisulcum Schmidt (1886)
Trossulus elegantulus (Grove & Sturt) Ross & Sims (1970)
Strangulonema barbadense Greville (1865)
Horodiscus rugosus Hajós (1975)
Medlinia simbirskiana (Witt) Sims (1998)
Goniothecium decoratum Brun (1891)