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Bucherina sandidgei


Classification: pf_mesozoic -> Rugoglobigerinidae -> Bucherina -> Bucherina sandidgei
Sister taxa: B. sandidgei, B. sp.,

Taxonomy

Citation: Bucherina sandidgei Bronnimann & Brown 1956
Rank: Species
Basionym: Bucherina sandidgei
Taxonomic discussion: Bucherina sandidgei appears to be a late descendant of Archaeoglobigerina of which it differs mainly in the asymmetrical periphery and the presence of one peripheral keel. [copied from Chronos database]

Type images:

Original description: Bucherina sandidgei Bronnimann & Brown 1956: Test low trochospiral, planoconvex in edge view, often presenting a shift in the axis of coiling in the adult stage. Outline subcircular to lobate, 5 1/2 to 6 slowly increasing in size chambers in the final whorl. Sutures slightly curved depressed between the last formed chambers of the final whorl, slightly raised and lined with a row of pustules between the earlier chambers of the final whorl. Umbilical sutures depresed. Periphery truncated presenting a faint keel mostly developed on the earlier chambers of the final whorl. Chambers flattened dorsally and inflated on the umbilical side. Umbilical diameter approximately 1/4 to 1/3 of the maximum test diameter. Main aperture interiomarginal, umbilical bordered bu a delicate tegilla, successive tegilla leaving both distal and proximal accessory apertures. Test surface presents scattered pustules and papillae lacking meridional arrangement.

Entries in the Catalog of original descriptions: Bucherina sandidgei;

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.30-69.18Ma, base in Maastrichtian stage). Data source: [copied from Chronos 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:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
umb chamber shape:Inflatedcoiling axis:Lowperiphery:Single keelaperture border:Tegilla
sp chbr shape:Inflatedumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:
spiral sutures:Moderately depresseddiameter mm:0.51width mm:N/Abreadth mm:0.36
final-whorl chambers:5.5-6.0

References:

Brönnimann, P. & Brown, N.K., (1956). Taxonomy of the Globotruncanidae. Eclogae Geologicae Helvetiae, 48: 503-562.


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Bucherina sandidgei compiled by the pforams@mikrotax project team viewed: 17-12-2017

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