Distinguishing features: Cavate holococcolith with box-shape, high rim and thin proximal plate, short spine on distal surface
| Daughter taxa: (blue => in age window 0-800Ma) | ||||
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| Specimens not identified to species level | ||||
Taxonomy:
Farinacci & Howe catalog pages: Thecatus *
Distinguishing features: Cavate holococcolith with box-shape, high rim and thin proximal plate, short spine on distal surface
Morphology remarks: "A cavate, box-shaped holococcolith. At 0 ĚŠ, in side view in XPL, the rim is relatively tall and the proximal plate thin. A bipar- tite structure/short spine sits atop the rim, completing the box shape. The spine is not visible on rotation." [Lees 2007]
Geological Range:
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Lees, J.A., (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research, 29(1): 39-65.References:
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Thecatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-2-2019
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