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Blefuscuiana cumulus


Classification: pf_mesozoic -> Praehedbergellidae -> Blefuscuiana -> Blefuscuiana cumulus
Sister taxa: B. alobata, B. cumulus, B. daminiae, B. depressa, B. implana, B. laculata, B. sp.,

Taxonomy

Citation: Blefuscuiana cumulus (Banner, Copestake, & White, 1993)
Rank: Species
Basionym: Blefuscuiana excelsa cumulus

Type images:

Original description: Blefuscuiana excelsa cumulus Banner, Copestake, & White 1993: Characterised by its high spired test, with its very convex dorsal surface, and by having 5 chambers in the last whorl. Test about 0.20mm at its maximum diameter, comprising about 2-3 whorls coiled in high trochospire. There are about 5 chambers in each of the penultimate and last whorls. The spiral side is strongly convex, and the intercameral sutures are moderately depressed, forming angles of about 135-140 degrees at the periphery of the test. The chambers are symetrical and increase in size gradually with growth, becoming depressed, being about half as high as long in the last whorl (when viewed from the spiral side). The umbilicus is small and deep, and the aperture is probably a narrow slit. Perforation-cones have not been found on this species.

Entries in the Catalog of original descriptions: Blefuscuiana excelsa cumulus;

Geological Range:
Last occurrence (top): within Aptian Stage (112.95-126.30Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian 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:chamber arrangement:Trochospiraledge view:aperture:
umb chamber shape:coiling axis:Highperiphery:aperture border:
sp chbr shape:umbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:shell porosity:
spiral sutures:Moderately depresseddiameter mm:0.2width mm:breadth mm:
final-whorl chambers:5.0-5.0

References:

Banner, F.T.; Copestake, P. & White, M.R., (1993). Barremian-Aptian Praehedbergellidae of the North Sea area: a reconnaisance. Bulletin of the Natural History Museum, London (Geology), 49: 1-30.


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Blefuscuiana cumulus compiled by the pforams@mikrotax project team viewed: 21-8-2017

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