pforams@mikrotax - Globanomalina ehrenbergi pforams@mikrotax - Globanomalina ehrenbergi

Globanomalina ehrenbergi


Classification: pf_cenozoic -> Globanomalinidae -> Globanomalina -> Globanomalina ehrenbergi
Sister taxa: G. australiformis, G. luxorensis, G. ovalis, G. imitata, G. planocompressa ⟩⟨ G. planoconica, G. chapmani, G. pseudomenardii, G. ehrenbergi, G. compressa, G. archeocompressa, G. sp.

Taxonomy

Citation: Globanomalina ehrenbergi (Bolli 1957)
Taxonomic rank: species
Basionym: Globorotalia ehrenbergi
Synonyms:
Taxonomic discussion: Bolli (1957a) erected this species for Paleocene morphotypes that had been referred to Ehrenberg's species. The basis for distinguishing this species from G. compressa is the pinched periphery and the thickened imperforate margin, which is more strongly developed than in G. compressa. Although Blow (1979) separated G. ehrenbergi from G. haunsbergensis, we include morphotypes with a more sharply acute periphery within the range of variation of G. ehrenbergi. Blow (1979) drew attention to the more lax coiling of G. haunsbergensis morphotypes, which results in a wide, shallow umbilicus. The trend towards a more strongly developed imperforate margin was recognized by Bolli and Blow as a trend towards a true keel, which resulted in the evolution of G. pseudomenardii. Globanomalina chapmani is also allied to G. ehrenbergi in having a pinched periphery and a thickened imperforate margin. As in G. pseudomenardii, the rate of chamber-size increase is greater than in G. ehrenbergi. [Olsson et al. 1999]

Catalog entries: Globorotalia ehrenbergi, Globorotalia haunsbergensis

Type images:

Distinguishing features:
Parent taxon (Globanomalina): Very low trochospiral; 5-6 chambers in final whorl; chamber-shape variable.
Aperture interiomarginal, umbilical-extraumbilical, arch with narrow lip.
Wall smooth, normally perforate, pustules in some species.

This taxon: Test compressed, smooth-walled, chambers moderately increasing in size. Periphery pinched with a thickened imperforate margin (faint keel). 5-5½ chambers in final whorl.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Compressedaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Petaloidumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Apparently a worldwide distribution in the low to middle latitudes. [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan in low to middle latitudes; based on Olsson et al. (1999)

Isotope paleobiology
Globanomalina ehrenbergi has δ18O and δ13C similar to Parasubbotina varianta, S. triloculinoides, and G. compressa. The species has distinctly more positive δ18O and more negative δ13C than Morozovella and Igorina. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 3 - Open ocean thermocline.

Phylogenetic relations
As pointed out by Bolli (1957a) and
Blow (1979), this species is transitional to G. pseudomenardii. It evolved from G. compressa by developing a more highly developed imperforate margin and a more sharply angular axial margin. [Olsson et al. 1999]

Most likely ancestor: Globanomalina compressa - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, fig 5a.
Likely descendants: Globanomalina chapmani; Globanomalina pseudomenardii; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Zone P2 to Zone P4. [Olsson et al. 1999]
Last occurrence (top): at top of P3 zone (100% up, 60.7Ma, in Selandian stage). Data source: Olsson et al. 1999, fig 5a
First occurrence (base): in mid part of P2 zone (50% up, 62.4Ma, in Danian stage). Data source: Olsson et al. 1999, fig 5a

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 42

References:

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 61-82. gs

Cushman, J. A. & Bermudez, P. J. (1949). Some Cuban species of Globorotalia. Contributions from the Cushman Laboratory for Foraminiferal Research. 25: 26-45. gs O

Gohrbandt, K. (1963). Zur Gliederung des Palaeogen im Helvetikum nordlich Salzburg nach planktonischen Foraminiferen. Mitteilungen der Geologischen Gesellschaft in Wien. 56(1): 63-. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs


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Globanomalina ehrenbergi compiled by the pforams@mikrotax project team viewed: 7-2-2025

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