pforams@mikrotax - Hedbergella gorbachikae pforams@mikrotax - Hedbergella gorbachikae

Hedbergella gorbachikae


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella gorbachikae
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> >>

Taxonomy

Citation: Hedbergella gorbachikae Longoria 1974
taxonomic rank: Species
Basionym: Hedbergella gorbachikae

Type images:

Original description: "Plano-convex test; umbilical side convex; last whorl general with 5 inflated chambers, last chamber protruding into the umbilical area covering most of the umbilicus. Test medium sized; plano-convex, spiral side, flatterend, umbilical side convex; periphery subcircular lobate; generally with 5 chambers in the last whorl; ultimate chamber protruding into the umbilical side; early chambers spherical in apertural view, last chamber ovoid; sutures radial, slightly curved, depressed on both umbilical and spiral sides; primary aperture extraumbilical-spiroumbilical; umbilicus completely or partly covered by the last chamber."

Entries in the Catalog of original descriptions: Hedbergella gorbachikae


Emended description:

Test medium sized, coiled in a flat to very slightly convex trochospire; 2 to 2.5 whorls; 5 to 5.5 (rarely 4.5 chambers in the outer whorl increasing rather gradually and slowly in size as added; chambers globular to subglobular, inflated, the last two or three tending to become subtriangualr on the umbilical side, subtrapezoidal on the spiral side, reniform when viewed laterally; last triangular chamber protruding toward the umbilicus and partly or wholly covering it; equatorial periphery subcircular to slightly ovoid, slightly to moderately lobate; sutures depressed, radial mainly straight; umbilical area small and rather deep; 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. [Huber & Leckie, 2011, p. 66]: Emended definition. Test wall finely perforate, smooth with moderately to strongly developed perforation cones on most chambers of the last whorl. Test medium in size, equatorial periphery subcircular to slightly ovoid, slightly to moderately lobate, 2 to 2.5 whorls coiled in a flat to slightly convex trochospire; chambers globular to subglobular, inflated, increase gradually in size, 4.5 to 5.5 in the final whorl with the last two or three tending to become subrounded to subtriangular on the umbilical side, subtrapezoidal on the spiral side, reniform in edge view, last chamber protruding into the umbilicus and partly or completely covering it; sutures depressed, radial and straight; umbilical area small and deep. Aperture a low to medium arch, which may be bordered by an imperforate rim. [copied from Chronos database]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:
sp chamber shape:Inflatedcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus: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:5-5.5 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. infracretacea zone (116.60-116.86Ma, base in Aptian stage). Data source: [copied from Chronos database - BUT zonal name changed from gorbachikae to infracretacea - this will be approx correct but may not be precise

Plot of range and occurrence data:

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

Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs

Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

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

Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs


logo

Hedbergella gorbachikae compiled by the pforams@mikrotax project team viewed: 19-6-2024

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=110242 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments (2)

Avatar
Peiyue Fang

No geological range-bar.

Avatar
Jeremy Young(UK)

The problem here is that the taxon eas recorded as having its FO in the H. gorbachikae zone which does not appear in modern zonations. As I understand it this zone is +/- equivalent to the H. infracretacea zone so I have emended the entry. However, if the details of Aptian correlation are important then do not rely on this.