Bacillariophyceae - Aulacoseirales
Parent taxon: Bacillariophyceae according to F. E. Round et al. 1990
Sister taxa: Acanthodiscus, Achnanthales, Anaulales, Annellus, Arachnoidiscales, Asterolamprales, Aulacodiscaceae, Bacillariales, Bacillariophycidae, Baxteria, Biddulphiales, Cavitatus, Chaetocerotaceae, Corethrales, Corinna, Coscinodiscales, Costopyxis, Cresswellia, Cussia, Cyclophorales, Cymatodiscus, Cymatosirales, Cymbellales, Detonia, Dextradonator, Diatomaceae, Dicladia, Discodiscus, Dispinodiscus, Entogonia, Epithelion, Ethmodiscales, Eunotiales, Eurossia, Eustephaniaceae, Fenestrella, Fenestrellina, Fragilariales, Gladius, Glyphodiscus, Goniothecium, Helminthopsis, Hemiaulales, Hemidiscaceae, Hendeya, Horodiscus, Huttonia, Ikebea, Incisoria, Kannoa, Katahiraia, Kentrodiscus, Kittonia, Kozloviella, Leptocylindrales, Licnophoridae, Liostephania, Liradiscus, Liriogramma, Lithodesmiales, Longinata, Mastogloiales, Melosirales, Monobrachia, Muelleriopsis, Naviculales, Neobrunia, Odontotropis, Omphalotheca, Paraliales, Peponia, Poretzkia, Porotheca, Praecymatosira, Pseudodimerogramma, Pseudopyxilla, Pseudostictodiscus, Pterotheca, Pyrgodiscus, Raphidineae, Rhabdonematales, Rhaphoneidales, Rhizosoleniales, Rhoicosphenia, Rhopalodiales, Rouxia, Schimperiella, Simonseniella, Solium, Stictodiscales, Striatellales, Surirellales, Symbolophora, Tabellariales, Thalassionematales, Thalassiophysales, Thalassiosirales, Thalassiosiropsis, Triceratiales, Trinacria, Trochosiropsis, Tubaformis, Tubulariidae, Tumulopsis, Vulcanella, Xanthiopyxis, Pennales, Centrales, Heterales
Subtaxa: Aulacoseiraceae
Ecology: "photoautotroph"
Distribution:
• Blancan of United States (1: Oregon collection)
• Eocene of Canada (4: British Columbia, Lac de Gras)
Total: 5 collections each including a single occurrence