pforams@mikrotax - Hedbergella tuschepsensis pforams@mikrotax - Hedbergella tuschepsensis

Hedbergella tuschepsensis


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella tuschepsensis
Sister taxa: << < 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. ventriosa, H. sp.

Taxonomy

Citation: Hedbergella tuschepsensis (Antonova in Antonova et al., 1964)
taxonomic rank: Species
Basionym: Globigerina tuschepsensis

Type images:

Original description: "Test small, round in outline, with a broadly rounded, scalloped peripheral margin. Consists of 9-10 spherical, rapidly enlarging chambers, forming 2-2.5 whorls with 4 chambers in each whorl. Chambers of initial whorl very small, distinctly discernible on dorsal side of test only at magnifications of X 80-120, lie nearly on a level with the following whorl or slightly over it. Chambers of later whorl much larger, the last one is especially distinguished, with a diameter barely not exceeding that of the 2 previous chambers taken together. In the center of the ventral side is a broad depressed umbilicus. Spiral and septal sutures distinct, depressed, last ones on dorsal side nearly straight, short, on ventral side a little longer, slightly curved. Aperture slitlike, extends along margin suture from umbilicus to peripheral margin. Wall very thin, finely perforate, semitransparent, smooth, shiny."

Entries in the Catalog of original descriptions: Globigerina tuschepsensis


Emended description:

Test small to medium, coiled on a flat to weakly depressed trochospire; 2 to 2.5 whorls; 4, occasionally 4.5, chambers in the outer whorl increasing slowly in the inner spire to rather rapidly in size as added in the outer whorl; last chamber twice as large the penultimate one; chambers globular to subglobular, possibly becoming slightly reniform in lateral view; equatorial periphery cross- to diamond-shaped, slightly to moderately lobate; sutures depressed, radial mainly straight; umbilical area wide 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]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5┬Ám
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. blowi zone (120.55-124.40Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. similis zone (124.40-126.01Ma, base in Barremian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Antonova, Z. A., Shmigina, T. A., Gnedina, A. G. & Kalugina, O. M. (1964). Neokom i apt Mezduretsiya Pshekha-Ubin (Severo-Zapadnii Kavkaz). Voprosy stratigrafii i litologii mezozoiskikh i kainozoiskikh otlozhenii Krasodarskogo Kraya. [Foraminifera of the Neocomian and Aptian of the Psheka-Ubin interfluve (NW Caucasus)]. Trudy Vsesoyuznogo Neftegazovogo Nauchno-issledovatelskogo Instituta, Krasnodarskiy Filial. 12: 3-72. gs

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


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Hedbergella tuschepsensis compiled by the pforams@mikrotax project team viewed: 25-7-2024

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