Globanomalina pseudomenardii


Classification: pf_cenozoic -> smooth non-spinose -> Hedbergellidae -> Globanomalina -> Globanomalina pseudomenardii
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 pseudomenardii (Bolli 1957)
Rank: Species
Basionym: Globorotalia pseudomenardii
Synonyms:
Taxonomic discussion: There is considerable variation in the shape of the equatorial periphery, which varies from fairly smooth to strongly lobulate, depending on the rate of size increase or decrease of the final few chambers in the ultimate whorl. [Olsson et al. 1999]

Catalog entries: Globorotalia pseudomenardii;

Type images:

Short diagnosis: Test spiroconvex with distinct keel & sharply-angled axial periphery. Umbilicus narrow. 5 (rarely 6) chambers in final whorl.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: The distinct keel, the sharply-angled axial periphery, spiroconvex test, and narrow umbilicus are distinguishing features. The number of chambers in the ultimate whorl is consistently 5, but rarely a 6 chambered form is observed. [Olsson et al. 1999]

Character matrix

test outline:Elongatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:-
umb chamber shape:Subtriangularcoiling axis:Very lowperiphery:Single keelaperture border:Thin lip
sp chbr shape:Petaloidumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Weakly depresseddiameter mm:0.34width mm:-breadth mm:-
final-whorl chambers:5.0-6.0

Biogeography and Palaeobiology


Geographic distribution: Widely reported in the low to middle latitudes (Figure 18). [Olsson et al. 1999]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Globanomalina pseudomenardii has ∂18O and ∂13C similar to Parasubbotina varianta and S. velascoensis. The species has distinctly more positive ∂18O and more negative ∂13C than Morozovella, Acarinina, and Igorina. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light δ13C and relatively heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Olsson et al. (1999)

Phylogenetic relations: There is general agreement among workers that G. pseudomenardii originated from G. ehrenbergi (= G. haunsbergensis Gohrbandt) by an increase in the test size and the development of a peripheral keel. The species becomes extinct at the top of Zone P4. [Olsson et al. 1999]

Most likely ancestor: Globanomalina ehrenbergi - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, fig 5a.

Biostratigraphic distribution

Geological Range:
Notes: Zone P4. [Olsson et al. 1999]
The FAD of Globanomalina pseudomenardii marks the base of zone P4a / top of P3b (Wade et al. 2011)
Last occurrence (top): at top of P4 zone (100% up, 57.1Ma, in Thanetian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): at base of P4 zone (0% up, 60.7Ma, in Selandian stage). Data source: zonal marker (Wade et al. 2011)

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 45

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, 1413 pp.

Bolli, H.M., (1957). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 61-82.

Ehrenberg, C.G., (1854). Mikrogeologie. L. Voss, Leipzig, 1-374 pp.

Hillebrandt von, A., (1962). Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg. Bayerische Akademie der Wissenschaften Mathematisch-Naturwissenschaftliche Klasse, Abhandlungen, Neue Folge, 108: 1-182.

Nederbragt, A.J. & van Hinte, J.E., (1987). Biometric Analysis of Planorotalites pseudomenardii (Upper Paleo- cene) at Deep Sea Drilling Site 605, Northwestern Atlantic. Initial Reports of the Deep Sea Drilling Project., 93: 577-592.

Nocchi, M.; Amici, E. & Premoli Silva, I., (1991). Planktonic foraminiferal biostratigraphy and paleoenvironmental interpretation of Paleogene faunas from the subantarctic transect, Leg 114. In: Ciesielski, P.F., Kristoffersen, Y. and al., e. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 233-273.

Olsson, R.K.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology. Smithsonian Institution Press, Washington, DC, 1-252 pp.

Subbotina, N., (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres, 2239: 1-144.

Wade, B.S.; Pearson, P.N.; Berggren, W.A. & Pälike, H., (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews, 104: 111-142.


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Globanomalina pseudomenardii compiled by the pforams@mikrotax project team viewed: 17-11-2017

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