Taxonomy clear
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Helicosphaeroides heezeniiLutetian
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Helicosphaera papillataLutetian - Ypresian
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Helicosphaera prolixaBartonian - Lutetian
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Helicosphaerella robinsoniaeRupelian - Priabonian
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Helicosphaeroides reticulataRupelian - Lutetian
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Helicosphaerella compactaRupelian - Lutetian
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Helicosphaerella clarissimaPriabonian - Lutetian
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Helicosphaerella moorkensiiLatdorfian
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Helicosphaerella gertaeAquitanian - Chattian
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Helicosphaerella inversaseraPriabonian
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Helicosphaerella pacificaTortonian
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Helicosphaeroides alatusBurdigalian
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Helicosphaera huangiiLatdorfian
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Helicosphaera ethologaRupelian
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Helicosphaeranudus hyalinaRecent - Serravalian
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Helicosphaeranudus pavimentumRecent - Piacenzian
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Sphenolithus indianicaThanetian
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Sphenolithus trachysThanetian
