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Loeblichella hessi


Classification: pf_mesozoic -> Globotruncanidae -> Loeblichella -> Loeblichella hessi
Sister taxa: L. coarctata, L. convexa, L. hessi, L. sp.,

Taxonomy

Citation: Loeblichella hessi (Pessagno, 1962)
Rank: Species
Basionym: Praeglobotruncana hessi hessi
Taxonomic discussion: The aperture on most specimens is difficult to see because it is obscured by hard matrix or large apertural flaps.
Praeglobotruncana hessi hessi n. sp., n. subsp. differs from Praeglobotruncana mattsoni Pessagno in its elongate, slightly more ovate chambers and by its more highly arched aperture. Like P. mattsoni it possesses coarse papillae on its early chambers and large apertural flaps. P. hessi hessi is somewhat similar to P. havanensis (Voorwijk)( = citae Bolli) in the shape of its chambers in both spiral and umbilical views. However, the chambers of P. hessi are wider, much more inflated, and do not show the development of a single keel. [copied from Chronos database]

Type images:

Original description: Spiral side flattened to gently convex, periphery lobulate, chambers increasing rapidly in size; nepionic chambers spherical, later chambers becoming markedly ovate; last whorl with 5-6 chambers; early chambers usually coarsely spinose; last 2-3 chambers smooth; sutures depressed, radial, slightly curved on both spiral and umbilical sides. Aperture interiomarginal; appers to be a low arch extraumbilical-umbilical in position; large apertural flaps extend into a broad umbilicus from each chamber.

Entries in the Catalog of original descriptions: Praeglobotruncana hessi hessi

Geological Range:
Last occurrence (top): within G. gansseri zone (71.75-72.97Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

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: Loeblichella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Compressedaperture:Extraumbilical-peripheral
    sp chamber shape:Petaloidcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Narrowly roundedaccessory apertures:
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Pessagno, E. A. (1962). The Upper Cretaceous stratigraphy and micropaleontology of south-central Puerto Rico. Micropaleontology. 8(3): 349-368. gs


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    Loeblichella hessi compiled by the pforams@mikrotax project team viewed: 25-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110323 Go to Archive.is to create a permanent copy of this page - citation notes



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