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Hedbergella sigali


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella sigali
Sister taxa: << < H. kuhryi, 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 sigali Moullade 1966
Rank: Species
Basionym: Hedbergella sigali
Synonyms: Praehedbergella grigelisae

Type images:

Original description: Translated from French. "Trochospiral test, ventrally involute, dorsally evolute (two whorls showing), of a small size (diameter 0.20 to 0.30mm), fairly compressed, with a lobate outline, 4 to 4.5 chambers (mostly 4) in the last whorl; the chambers are globular, with a fair increase in height as added. Spiral side most of the time flat, sometimes more or less convex, as a result of a raising (never very marked) of the trochospire. Ventral side without umbilicus. Aperture, ventral, umbilical-extraumbilical, reaching the periphery, bordered by a short lip."

Entries in the Catalog of original descriptions: Hedbergella sigali, Praehedbergella grigelisae


Emended description: Test small to medium, coiled on a flat to weakly convex trochospire; 2 to 2.5 whorls; 4 to occasionally 4.5 chambers in the outer whorl increasing slowly to rather rapidly in size as added; chambers globular to subglobular, possibly becoming slightly reniform in lateral view; equatorial periphery cross-shaped, slightly to strongly lobate; sutures depressed, radial mainly straight; umbilical area, when present, small and shallow; aperture as a low to medium arch bordered by a lip. Wall smooth, finely perforate, that may be covered by perforation cones in the early chambers of the last whorl. [copied from Chronos database]

Geological Range:
Last occurrence (top): within T. bejaouaensis zone (113.26-118.02Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of H. sigali zone (0% up, 134.7Ma, in Valanginian 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 sigali, synonyms included - Claviblowiella sigali; Hedbergella sigali; Praehedbergella grigelisae;
  • space-time plot :: Samples map :: Parent: Hedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:
    sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:N/A
    spiral sutures:Strongly depressedumb depth:Deepwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-4.5 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

    Moullade, M. (1966). Etude stratigraphique et micropaleontologique du Crétacé inférieur de la "fosse vocontienne". Documents des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 15: 1-369. gs


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    Hedbergella sigali compiled by the pforams@mikrotax project team viewed: 8-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110263 Go to Archive.is to create a permanent copy of this page - citation notes



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