pforams@mikrotax - Globanomalina planocompressa

pforams@mikrotax - Globanomalina planocompressa pforams@mikrotax - Globanomalina planocompressa

Globanomalina planocompressa

Classification: pf_cenozoic -> Globanomalinidae -> Globanomalina -> Globanomalina planocompressa
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.

Olsson_etal_99_pl36_f02-3_f06.jpg
Olsson_etal_99_pl36_f01_f04-5.jpg

Taxonomy

Citation: Globanomalina planocompressa (Shutskaya 1965)

Taxonomic rank: species

Basionym: Globorotalia planocompressa

Synonyms:

Globorotalia compressa (Plummer).—Loeblich and Tappan, 1957a: 188, pl. 40: fig.5a-c [paratypic by synonymy, type Danian, Ostratorp], pl. 41: fig.5a-c [Zone Plb, McBryde Fm., Alabama] [in part, not pl. 42: fig. 5a-c, pl. 44: figs. 9, 10].
Globorotalia planocompressa planocompressa Shutskaya, 1965:179, pl. 1: fig. 6a-c [lower Paleocene, northern Caucasus].
Globorotalia (Turborolalia) compressa planocompressa Shutskaya.—Blow, 1979:1067, pl. 68: figs. 4, 8-10 [Zone Pla, DSDP Hole 47.2/11/3: 0-5 cm], pl. 71: figs. 8-10 [Zone Pl, DSDP Hole 47.2/1/1: 0-1 cm; Shatsky Rise, northwestern Pacific Ocean].
Globanomalina planocompressa Shutskaya.—Olsson, Hemleben, Berggren, and Liu, 1992:207, pl. 7: figs. 6-8 [Zone Pla, Clayton Basal Sands, Millers Ferry, Alabama]. [Olsson et al. 1999]

Taxonomic discussion: Although the original types are presumably lost, the meaning of this taxon seems clear from study of the Russian collections, and Blow's (1979) analysis of the species is followed herein. He based his analysis on the specimen figured by Loeblich and Tappan (1957a, pl. 40: fig. 5a-c), which became a paratype of this species when Shutskaya included this specimen in synonymy with her new species. Globanomalina planocompressa is the first member of the
planocompressa -imitata -ovalis lineage, a lineage characterized by inflated, perforate-walled chambers. [Olsson et al. 1999]

Catalog entries: Globorotalia planocompressa, Globorotalia planocompressa planocompressa

Type images:

x: G. planocompressa

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: 5 chambers in the final whorl, increasing moderately in size. The chambers are more inflated than in G. archeocompressa and globular to ovoid.

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: Circular chamber arrangement: Trochospiral edge view: Inequally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Inflated coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Inflated umbilicus: Narrow periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Strongly depressed umb depth: Deep wall texture: Smooth shell porosity: Finely Perforate: 1-2.5µm
umbilical or test sutures: Strongly depressed final-whorl chambers: 5-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Known distribution in the northern hemisphere middle and low latitudes. [Olsson et al. 1999]
Aze et al. 2011 summary: Northern hemisphere and middle to low latitudes; based on Olsson et al. (1999)

Isotope paleobiology

Globanomalina planocompressa has δ18O and 5'3C similar to Parasubbotina pseudobulloides, S. triloculinoides, and E. eobulloides. The species has distinctly more positive δ18O and more negative δ13C than Praemurica and Woodringina. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light _¹³C and relatively heavy _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Olsson et al. (1999)

Phylogenetic relations

This species originates in Zone Pa from G. archeocompressa by the inflation of chambers and the loss of an imperforate peripheral margin. It, in turn, gives rise to G. imitata in Zone Pic. [Olsson et al. 1999]

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

Biostratigraphic distribution

Geological Range:
Notes: Upper Zone Pa to Zone Pic. [Olsson et al. 1999]
Last occurrence (top): in mid part of P1c subzone (50% up, 63.3Ma, in Danian stage). Data source: Olsson et al. 1999, fig 5a
First occurrence (base): in mid part of Pa zone (50% up, 65.9Ma, in Danian stage). Data source: Olsson et al. 1999, fig 5a

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Globanomalina planocompressa, synonyms included - Globanomalina planocompressa;
See also space-time plot :: Samples map :: Parent: Globanomalina

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 44

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

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. 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: 173-198. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Liu, C. (1992). Wall Texture Classification of planktonic foraminifera genera in the Lower Danian. Journal of Foraminiferal Research. 22(3): 195-213. 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

Shutskaya, E. K. (1965). Phylogenetic interrelationship of species of the Globorotalia compressa Plummer group in Danian time and the Paleocene Epoch. Voprosyi Mikropaleontologii. 9: 180-188. gs

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

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test outline:	Circular	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Inflated	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Smooth	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	5-5	N.B. These characters are used for advanced search. N/A - not applicable