Taxonomy clear
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Helicosphaerella clarissimaLutetian - Priabonian
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Helicosphaerella moorkensiiLatdorfian
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Helicosphaerella gertaeChattian - Aquitanian
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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 hyalinaSerravalian - Recent
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Helicosphaeranudus pavimentumPiacenzian - Recent
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Sphenolithus indianicaThanetian
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Sphenolithus trachysThanetian
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Sphenolithus bouketoThanetian
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Sphenolithus ankathiasThanetian
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Sphenolithus atlanticusLutetian
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Sphenolithus trigonikosThanetian
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Sphenolithus asperThanetian
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Sphenolithus chamilosThanetian
