| Daughter taxa (blue => in age window 0-300Ma) | ||||
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| Specimens which cannot be assigned to established species | ||||
Taxonomy
Original description: Microhedbergella Huber and Leckie, 2011:
Test wall thin, microperforate, wall pores evenly distributed and variably spaced in adult chambers, surface smooth or with scattered and weakly developed pustules. Test small to moderate in size, coiled in a very low to low trochospire, spiral side evolute, umbilical side mostly involute; chambers globular, never elongated radially, increasing rapidly to moderately in size, with 3–6 in the final whorl; aperture a low interiomarginal, umbilical-extraumbilical arch bordered by a thin lip or flap that may extend partly into umbilical region.
Entries in the Catalog of original descriptions: Microhedbergella;
Short diagnosis:
Test wall thin, microperforate, surface smooth or with scattered and weakly developed pustules. Test low trochopiral, small, chambers globular, increasing rapidly to moderately in size, with 3–6 in the final whorl; aperture a low interiomarginal, umbilical-extraumbilical arch bordered by a thin lip or flap.
Geological Range:
Last occurrence (top): near top of Maastrichtian Stage (90% up, 66.6Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Aptian Stage (91% up, 114.2Ma, in Aptian stage). Data source: Total of range of species in this database
Plot of occurrence data:
NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.
Character matrix
| test outline: | chamber arrangement: | Trochospiral | edge view: | aperture: | Umb.-extraumbilical | ||
| umb chamber shape: | coiling axis: | periphery: | N/A | aperture border: | Thin lip | ||
| sp chbr shape: | umbilicus: | periph margin shape: | Moderately rounded | accessory apertures: | |||
| umbilical or test sutures: | umb depth: | wall texture: | shell porosity: | Microperforate: <1µm | |||
| spiral sutures: | diameter mm: | width mm: | breadth mm: | ||||
| final-whorl chambers: | 0.0-0.0 |
References:
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Microhedbergella compiled by the pforams@mikrotax project team viewed: 26-9-2017
Go to Archive.is to create a permanent copy of this page - citation notes |