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Hedbergella maslakovae


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella maslakovae
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, 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, > >>

Taxonomy

Citation: Hedbergella maslakovae Longoria 1974
Rank: Species
Basionym: Hedbergella maslakovae
Taxonomic discussion: This species is characterised by its minute test, very low trochospire, with a flat dorsal side, ovate to semi-elongate chambers in the last whorl, increasing slowly in height, and a wide umbilicus.
This species displays a small morphological variability mainly regarding the number of chambers (6 to 6.5) in the outer whorl, their elongation degree and the spiral side which may range from low to flat. [copied from Chronos database]

Type images:

Original description: Medium sized, test as with genus; consisting of 3 whorls; spiral side convex; peripheral margin circular, strongly lobate; 6-7 chambers in the last whorl; chambers inflated, ovoid to semi-elongate; spherical to ovoid in peripheral view; sutures radial, slightly curved on both spiral and umbilical sides; primary aperture extraumbilical to spiroumbilical, a low equatorial arch bordered by an imperforate porticus; relict apertures and flaps present on both spiral and umbilical sides; umbilical area wide; penultimate whorl partly exposed.

Entries in the Catalog of original descriptions: Hedbergella maslakovae


Emended description: Test medium sized, trochospirally coiled; 6 to 6.5 chambers in the outer whorl, increasing very slowly and gradually in size as added; chambers initially globular to subglobular, the last three or four tending to become slightly radially elongate, round at their end; spiral side very low to flat; peripheral outline subcircular, strongly lobate; 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 L. cabri zone (123.89-125.71Ma, base in Aptian 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:Spiroconvexaperture:
    sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:6.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    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 maslakovae compiled by the pforams@mikrotax project team viewed: 9-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110251 Go to Archive.is to create a permanent copy of this page - citation notes



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