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Hedbergella bizonae


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella bizonae
Sister taxa: H. aptiana, H. bizonae, H. bollii, H. compacta, H. excelsa, H. gorbachikae, H. handousi, H. hexacamerata, H. hispaniae, H. infracretacea, H. kuhryi, H. kuznetsovae, H. labocaensis, H. luterbacheri, H. maslakovae, H. mitra, H. modesta, > >>

Taxonomy

Citation: Hedbergella bizonae (Chevalier, 1961)
Rank: Species
Basionym: Hastigerinella bizonae
Synonyms:
Taxonomic discussion: This species displays a rather wide morphological variability mainly concerning the number of chambers (5.5 to 6.5) and the height of the spire, ranging from flat to moderately high; slight variations in the degree of chamber elongation have been also detected. [copied from Chronos database]

Type images:

Original description: Translated from French: Test small, calcareous, finely perforate, trochoidal, sutures distinct and depressed. Nine to 11 chambers, 4 to 5 small chambers forming 1 - 1.5 internal whorls. Five to 6 chambers, regularly and strongly increasing in size in the last whorl and shaping a stellate outline with ogival ends. In most specimens these chambers are axially elongate, the axes inclining forward and also lying on either side of the equatorial plane. Apertural side convex, equi-dimensional or with a shape varying from an almost square to ogival section. Spiral side generally flat. On the umbilical side, a wide and depressed umbilicus. Aperture arched, interiomarginal, located at the base of the umblical side.

Entries in the Catalog of original descriptions: Hastigerinella bizonae, Lilliputianella longorii


Emended description: Test medium sized, trochospirally coiled, slightly laterally compressed; 5.5 to 6.5 chambers in the outer whorl, increasing gradually and slowly in size as added; all the chambers of the outer whorl slightly radially elongate and laterally compressed, pointed at their end; spiral side flat to moderately high; peripheral outline ovoid, strongly lobate to stellate; sutures straight to slightly curved on both spiral and umbilical sides; umbilicus broad 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): within G. blowi zone (125.71-128.73Ma, base in Barremian 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: Hedbergella

    Character matrix

    test outline:Stellatechamber arrangement:Trochospiraledge view:Hourglassaperture:-
    sp chamber shape:Subtriangularcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:N/A
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Chevalier, J. (1961). Quelques nouvelles espèces de Foraminifères dans le Crétacé inférieur méditerranéen. Revue de Micropaléontologie. 4(1): 30-36. gs

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


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    Hedbergella bizonae compiled by the pforams@mikrotax project team viewed: 5-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110238 Go to Archive.is to create a permanent copy of this page - citation notes



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