Conusphaera maledicto
Set number: 2945
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Set number: 2944
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In the mobile mount
Set number: 2943
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Holotype in the mobile mount
Set number: 2942
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In the mobile mount
Set number: 2941
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In the mobile mount
Set number: 2940
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In the mobile mount
Set number: 2939
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In the mobile mount
Set number: 2938
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In the mobile mount
Conusphaera maledicto Varol & Bowman, 2019
From Latin maledicto, fence – referring to its fencelike appearance in the light microscope
Dimensions of holotype: Height = 2.52 μm; width (maximum) = 3.57 μm.
Small species (< 4.0 μm) of Conusphaera have a truncated conical shape, with the width commonly exceeding the height. The central core consists of four straight (uncurved) core segments that are visible in side view under the light microscope. In plan view, the species is strongly elliptical and individual segments are not discernible.
In side view under crossed polars at 0°, the lateral segments of the central core display first‑order white interference colours, whereas the very thin outer wall segments remain in constant extinction. In plan view, the central core likewise shows white interference colours, while the outer protolith wall remains in constant extinction.
Varol, O. & Bowman, A.R. 2019. Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291/1 (2019): 1–23
Holotype
Conusphaera maledicto
Varol & Bowman, 2019
Late Tithonian
De Soto Canyon, Eastern Gulf of Mexico