Daughter taxa (time control age-window is: 0-800Ma)![]() | |||||
![]() | Sphenolithus abies Moderately elevated sphenolith with cuspate outline and with extinction line going down long axis of spine. | ||||
Sphenolithus apoxis Conical sphenolith with a compound apical spine. (like S. abies but older) | |||||
Sphenolithus bipedis Hemispherical with a flared proximal cycle and arcuate proximal surface | |||||
Sphenolithus neoabies Like S. abies/moriformis but smaller, <4µm & base broad | |||||
![]() | Sphenolithus moriformis Beehive shaped sphenolith, apical elements not in extinction in vertical position. No spine, upper and lower parts of similar size. | ||||
![]() | ![]() | Sphenolithus puniceus Hemispherical, like S. moriformis but larger (7-11 µm) and therefore more birefringent | |||
Sphenolithus grandis Large (>10 µm) beehive shaped sphenoliths | |||||
Eocene species | |||||
![]() | ![]() | ![]() | ![]() | Sphenolithus acervus Large (>8.0µm) globular, coarsely-constructed sphenolith without a spine. | |
Sphenolithus primus Small with dome-shaped opening on proximal side |
Taxonomy:
Distinguishing features: Conical and hemispherical sphenoliths without prominent apical spines.
Farinacci & Howe catalog pages:
Search data:Tags | LITHS: |
Metrics | Lith size: 3->12µm; |
Geological Range:
Last occurrence (top): near base of Piacenzian Stage (14% up, 3.5Ma, in Piacenzian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Danian Stage (90% up, 62.1Ma, in Danian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gsReferences:
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S. moriformis group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1215 Go to Archive.is to create a permanent copy of this page - citation notes |