Taxonomy clear
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Chiasmolithus eograndisYpresian
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Helicosphaeroides africanusChattian
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Helicosphaeroides minimusLatdorfian - Chattian
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Helicosphaera acutaGelasian - Calabrian
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Helicosphaera truempyiChattian
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Helicosphaera amplaChattian
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Helicosphaerella perch-nielseniaeLatdorfian - Langhian
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Helicosphaerella elongataLatdorfian - Serravalian
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Helicosphaera tenebriscornusLanghian - Meghalayan
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Helicosphaeroides californianaBurdigalian - Serravalian
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Helicosphaera paleocarteriBurdigalian - Tortonian
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Helicosphaera incisuraSerravalian - Zanclean
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Helicosphaerella grandeporisChattian - Aquitanian
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Helicosphaera princeiTortonian - Meghalayan
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Helicosphaera consimilisZanclean - Meghalayan
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Helicosphaera burkeiAquitanian - Meghalayan
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Helicosphaerella bipunctaLatdorfian - Langhian
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Helicosphaera intermediaBartonian - Zanclean
