|Daughter taxa (time control age-window is: 0-800Ma)|
Specimens which cannot be assigned to established species
Taxonomic discussion: Huber and Leckie, 2011: Microhedbergella differs from Hedbergella primarily by its generally smaller size, particularly in the early species, by having a thinner shell wall (~2-3 microns) that is microperforate with a smooth surface, and by always having an apertural lip or flap. Microhedbergella resembles Praehedbergella because of its small test size, relatively thin wall and smooth wall texture, but these genera are considered as distantly related homeomorphic lineages because of the stratigraphic gap that separates species included within each of the genera
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
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: 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.
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 range and occurrence data:
|test outline:||chamber arrangement:||Trochospiral||edge view:||aperture:||Umbilical-extraumbilical|
|sp chamber shape:||coiling axis:||periphery:||N/A||aperture border:||Thin lip|
|umb chbr shape:||umbilicus:||periph margin shape:||Moderately rounded||accessory apertures:|
|spiral sutures:||umb depth:||wall texture:||shell porosity:||Microperforate: <1µm|
|umbilical or test sutures:||final-whorl chambers:||0.0-0.0||N.B. These characters are used for advanced search. N/A - not applicable|
Microhedbergella compiled by the pforams@mikrotax project team viewed: 21-9-2021
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