pforams@mikrotax - Hedbergella kuznetsovae pforams@mikrotax - Hedbergella kuznetsovae

Hedbergella kuznetsovae


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella kuznetsovae
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> >>

Taxonomy

Citation: Hedbergella kuznetsovae (Banner&Desai, 1988)
taxonomic rank: Species
Basionym: Blefuscuiana kuznetsovae
Taxonomic discussion: E+M image of holotype is really terrible. [copied from Chronos database]

Type images:

Original description: Test a low trochospire, completely evolute and flat or slightly concave on the spiral side, with 6-8 chambers in the last whorl. On the spiral side, chambers are inflated, subglobular, approximately as high as long, intercameral sutures being depressed and radial or very slightly oblique, the spire opens slowly; on the spiral side the test diameter is 2.5-2.8 times the height of the last formed chamber. The umbilicus is broad (about 0.27 of the test diameter) and shallow; on this side, the sutures are depressed and radial. The aperture is a low arch, from the umbilicus to the periphery of the penultimate whorl, with a distinct porticus which broadens slightly posteriorly; discrete relict apertures and their portici are open for at least half of the last whorl. The wall is smooth and microperforate, the external openings of the perforations being 0.6-0.7 microns in diameter, spaced at 1.3-5 microns distance.

Entries in the Catalog of original descriptions: Blefuscuiana kuznetsovae

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6-8 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within T. rohri (-Ma, top in "Holocene" stage). Data source: copied from Chronos database, but zonal name updated from T. bejaouaensis to T. rohri
First occurrence (base): within H. sigali zone (130.37-134.74Ma, base in Valanginian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Banner, F. T. & Desai, D. (1988). A review and revision of the Jurassic-Early Cretaceous Globigerinina,with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England). Journal of Micropalaeontology. 7: 143-185. 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 kuznetsovae compiled by the pforams@mikrotax project team viewed: 19-6-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110248 Go to Archive.is to create a permanent copy of this page - citation notes



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