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Umbilicosphaera sibogae Calcidiscus leptoporus Calcidiscus quadriperforatus Umbilicosphaera sibogae var. foliosa Umbilicosphaera hulburtiana Coccolithus pelagicus Calyptrosphaera sphaeroidea Helladosphaera Cruciplacolithus neohelis Hymenomonas globosa Ochrosphaera Jomonlithus littoralis Hymenomonas coronata Pleurochrysis dentata Chrysotila carterae Helicosphaera carteri Scyphosphaera apsteinii Algirosphaera robusta Syracosphaera pulchra Coronosphaera mediterranea Isochrysis galbana Isochrysis litoralis Emiliania huxleyi Prymnesium calathiferum Prymnesium parvum Prymnesium pigrum Imantonia rotunda Phaeocystis Pavlova virescens Pavlova pinguis Rebecca salina Exanthemachrysis gayraliae Cyclonexis Chrysoxys Ochromonas Odontella Thraustochytrium
0 500 1000 1500 1900 Time (MYA)
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