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Hedbergella similis


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella similis
Sister taxa: << < H. kuznetsovae, H. labocaensis, H. luterbacheri, H. maslakovae, H. mitra, H. modesta, H. occulta, H. praelippa, H. praetrocoidea, H. primare, H. quadricamerata, H. roblesae, H. ruka, H. semielongata, H. sigali, H. similis, H. speetonensis, H. tardita, H. tatianae, H. trocoidea, H. tunisiensis, H. tuschepsensis, H. sp.,

Taxonomy

Citation: Hedbergella similis Longoria 1974
Rank: Species
Basionym: Hedbergella similis
Synonyms: Lilliputianella similis (Longoria) - Banner et al. 1993
Taxonomic discussion: This species displays a rather wide morphological variability mainly regarding the number of chambers (5 to 6) in the outer whorl and their elongation, especially of the last one. [copied from Chronos database]

Type images:

Original description: "Medium sized, test as with genus; formed by 2-3 whorls; peripheral margin elongate, strongly lobate; 5-6 chambers in the last whorl, increasing in size as added; chambers ovate to elongate on both spiral and umbilical sides, ovoid in peripheral view; sutures radial, slightly curved, depressed on both umbilical and spiral sides; umbilicus wide, shallow; relict apertures often observed on spiral side."

Entries in the Catalog of original descriptions: Hedbergella similis


Emended description: Test medium sized, trochospirally coiled; 5 to 6 chambers in the outer whorl, increasing slowly and gradually in size as added; chambers initially globular to subglobular, the last two or, exceptionally, three tending to become slightly radially elongate, the final one may be more elongate in some specimens; chambers round at their end; spiral side low; peripheral outline ovoid, lobate; sutures straight to slightly curved on both spiral and umbilical sides; umbilicus rather wide and shallow; aperture as a low extraumbilical arch reaching the periphery. Wall smooth and finely perforate. [copied from Chronos database]

Geological Range:
Last occurrence (top): within G. algerianus zone (118.93-122.17Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of H. similis zone (0% up, 130.4Ma, in Barremian stage). Data source: zonal marker (from Timescale Creator)

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

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Hedbergella similis, synonyms included - Hedbergella similis;
  • space-time plot :: Samples map :: Parent: Hedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:
    sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    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. gs

    Lipson-Benitah, S. & Almogi-Labin, A. (2004). Aptian planktonic foraminifera from Israel. Israel Journal of Earth Sciences. 53(1): 27-46. gs

    Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs


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    Hedbergella similis compiled by the pforams@mikrotax project team viewed: 11-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110264 Go to Archive.is to create a permanent copy of this page - citation notes



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