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Whiteinella bornholmensis


Classification: pf_mesozoic -> Hedbergellidae -> Whiteinella -> Whiteinella bornholmensis
Sister taxa: W. aprica, W. archaeocretacea, W. aumalensis, W. baltica, W. bornholmensis, W. brittonensis, W. inornata, W. paradubia, W. sp.,

Taxonomy

Citation: Whiteinella bornholmensis (Douglas and Rankin, 1969)
Rank: Species
Basionym: Hedbergella bornholmensis

Type images:

Original description: "Test free, low trochospiral, equatorial periphery strongly lobulate, axial periphery rounded. Chambers subglobular to subspherical, three and one half to four chambers in the final whorl; initial chambers increasing gradually insize, final three or four increasing very rapidly, last formed chamber much larger than penultimate, giving test a trilobate appearance. Spiral and umbilical sutures radial to slightly curved, depressed, distinct. Wall calcareous, perforate, surface covered with small spines. Umbilical deep and narrow in juvenile stage, becoming shallower in adult. Primary aperture is a high interiomarginal-umbilical arch a narrow bordering lip. "Comment. - The species is similar to Whiteinella baltica, Douglas and Rankin, but may be differentiated by, (1) the trilobate shape of the test, (2) the rapid whorl expansion in the final volution, and (3) the more extra-umbilical position of the primary aperture. Hedbergella portsdownensis (Williams-Mitchell) [Globigerina portsdownensis, 1948] is more strongly spiroconvex, has a smaller and deeper umbilicus and lacks the distinctive spinose surface. Apart from Bornholm Island, the species has been found in northern Germany and its presence is suspected in other parts of the Polish-Danish seaway."

Entries in the Catalog of original descriptions: Hedbergella bornholmensis

Geological Range:
Last occurrence (top): in lower part of Santonian Stage (30% up, 85.5Ma, in Santonian stage). Data source:
First occurrence (base): at base of Santonian Stage (0% up, 86.3Ma, in Santonian stage). Data source:

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Whiteinella

    Character matrix

    test outline:Triangularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Inflatedcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Moderately muricateshell porosity:
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.5-4.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Douglas, R. G. & Rankin, C. (1969). Cretaceous planktonic foraminifera from Bornholm and their zoogeographic significance. Lethaia. 2: 185-217. gs


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    Whiteinella bornholmensis compiled by the pforams@mikrotax project team viewed: 16-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110576 Go to Archive.is to create a permanent copy of this page - citation notes



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