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From
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To
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Geolocation
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Author - title
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Year
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| details | Eocene | India(Assam) | Srivastava,N.C. et al. Hystrichosphaerids from Tertiary subcrops of Assam, India. | 1969 | |
| details | Devonian | Spain | Sarjeant,W.A.S. Xanthidia, Palinospheres and "Hystrix": A review of the study of fossil unicellular microplankton with organic cell walls. | 1970 |