Doodle showing the diatom Plagiogramma Fossil Diatom Atlas
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Arachnoidiscus clarus Brown (1933)
Auliscus johnsonianus Greville (1863)
Actinoptychus intermedius Schmidt (1896)
Archaegoniothecium langebertalotii Witkowski, Harwood & Kulikovskiy (2012)
Truania archangelskiana Pantocsek (1886)
Asterolampra vulgaris Greville (1862)