Muricohedbergella sliteri

Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella sliteri
Sister taxa: M. almadenensis, M. angolae, M. astrepta, M. atlantica, M. blakensis, M. crassa, M. delrioensis, M. flandrini, M. hoelzli, M. holmdelensis, M. implicata, M. kyphoma, M. loetterli, M. monmouthensis, M. planispira, M. portsdownensis, M. praelibyca, M. rosebudensis, M. sliteri, M. wondersi, M. sp.,


Citation: Muricohedbergella sliteri Huber 1990
Rank: Species
Basionym: Hedbergella sliteri
Taxonomic discussion: Populations of this species were compared with topotypes of H. monmouthensis (Olsson) from the Red Bank Formation (New Jersey) and SEM illustrations of H. holmdelensis Olsson and H. monmouthensis provided by R. K. Olsson (pers. comm., 1987). Hedbergella sliteri differs by its larger size, chambers that increase more gradually in size, fewer number of chambers in the penultimate whorl and broader umbilical region. The frequency of specimens with kummerform final chambers is higher among the Maud Rise assemblages than those of the Falkland Plateau. [copied from Chronos database]

Type images:

Original description: Test coiled in a low trochospire and sometimes nearly planispiral, often flattened on the spiral side, convex on the umbilical side, average diameter 0.273 mm, average breadth 0.123 mm. Chambers inflated, slightly reniform to globular, increasing gradually in size, usually five to six in the final whorl, four and one-half to six in the penultimate whorl, 12 to 15 comprising the entire test of adult specimens, final chamber normalform or sometimes kummerform. Proloculus diameter averaging 0.17 mm, initial whorl diameter averaging 0.74 mm, with a mean of 5.0 chambers in the initial whorl. Sutures strongly depressed, radial and straight on the spiral and umbilical sides. Umbilicus shallow, broad, averaging 28% of the maximum test diameter. Aperture a low, interiomarginal arch, extra-umbilical, sometimes positioned very near the equatorial periphery, bordered by a narrow porticus. Relict apertures and apertural flaps well-developed. Test surface nearly smooth to finely pustulose, outer wall radial hyaline, finely perforate.

Entries in the Catalog of original descriptions: Hedbergella sliteri

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 C. plummerae zone (76.18-79.20Ma, base in Campanian 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

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely pustuloseshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable


Huber, B. T. (1990). Maestrichtian planktonic foraminifer biostratigraphy of the Maud Rise (Weddell Sea, Antarctica): ODP Leg 113 Holes 689B and 690C. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 489-513. gs


Muricohedbergella sliteri compiled by the pforams@mikrotax project team viewed: 29-9-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110376 Go to Archive.is to create a permanent copy of this page - citation notes

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