Globanomalina chapmani


Classification: pf_cenozoic -> smooth non-spinose -> Hedbergellidae -> Globanomalina -> Globanomalina chapmani
Sister taxa: G. archeocompressa, G. australiformis, G. chapmani, G. compressa, G. ehrenbergi, G. imitata, G. luxorensis, G. ovalis, G. planocompressa, G. planoconica, G. pseudomenardii, G. sp.,

Taxonomy

Citation: Globanomalina chapmani (Parr 1938)
Rank: Species
Basionym: Globorotalia chapmani
Synonyms:
Taxonomic discussion: Haig et al.'s (1993) illustrations of the holotype, paratypes, and topotypes taken by SEM has clarified the morphologic characters of this species. It is clear from these illustrations that Anomalina luxorensis Nakkady (1951), Globanomalina ovalis var. lakiensis Haque (1956), the form identified by Subbotina (1953, pl. 16: fig. 12a-c) as Globorotalia membranacea (Ehrenberg, 1854), and the form identified by Bolli (1957a, pl. 20: figs. 11-13) as Globorotalia elongata (Glaessner, 1937a) should be placed in the synonomy of G. chapmani. In addition, Globorotalia troelseni Loeblich and Tappan (1957a) and the form identified by Hillebrandt (1962, pl. 12: fig. 3a-c) as Globorotalia ehrenbergi Bolli (1957a) are 5-chambered, compressed, smooth-walled forms that can be
placed in G. chapmani. Globanomalina chapmani is a common species in upper Paleocene assemblages. [Olsson et al. 1999]

Catalog entries: Globorotalia chapmani;

Type images:

Short diagnosis: This species is identified by its compressed test, pinched periphery with a thickened imperforate band, and the rapidly enlarging chambers. The number of chambers in the ultimate whorl is typically 5 but can range up to 6. The test walls are smooth with occasional small pustule buildups in the umbilical area and on the inner spiral area.

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: This species is identified by its compressed test, pinched periphery with a thickened imperforate band, and the rapidly enlarging chambers. The number of chambers in the ultimate whorl is typically 5 but can range up to 6. The test walls are smooth with occasional small pustule buildups in the umbilical area and on the inner spiral area. [Olsson et al. 1999]

Character matrix

test outline:Ellipticalcoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Narrow
edge view:Equally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:-
wall texture:Smoothaperture:Umb.-extraumbilicalaperture border:Thin lipaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Moderately rounded
umb depth:Deepdiameter mm:0.65width mm:-breadth mm:-
final-whorl chambers:5.0-6.0

Biogeography and Palaeobiology


Geographic distribution: Worldwide in the middle and high latitudes. [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan in middle to high latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Globanomalina chapmani has ∂18O and ∂13C similar to Parasubbotina varianta, S. triloculinoides, and G. pseudomenardii. 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: Globanomalina chapmani is a member of the smooth-walled imperforate periphery lineage and evolved from G. ehrenbergi (Bolli) in the lower part of Zone P4. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Within Zone P3 to Zone P6. [Olsson et al. 1999]
Last occurrence (top): within E3 zone (54.61-55.20Ma, top in Ypresian stage). Data source: Olsson et al. 1999
First occurrence (base): within P3 zone (60.73-62.29Ma, base in Danian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 39

References:

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.

Parr, W.J., (1938). Upper Eocene Foraminifera from Deep Borings in King's Park, Perth, Western Australia. Journal of the Royal Society of Western Australia, 24: 69-101.

Speijer, R.P. & Samir, A.M., (1997). Globanomalina luxorensis, a Tethyan biostratigraphic marker of latest Paleocene global events. Micropaleontology, 43: 51-62.

Toumarkine, M. & Luterbacher, H. (Editors), (1985). Paleocene and Eocene planktic foraminifera. Plankton Stratigraphy. Cambridge Univ. Press, Cambridge, 87-154 pp.


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Globanomalina chapmani compiled by the pforams@mikrotax project team viewed: 22-7-2017

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