pforams@mikrotax - Globanomalina australiformis

pforams@mikrotax - Globanomalina australiformis pforams@mikrotax - Globanomalina australiformis

Globanomalina australiformis

Classification: pf_cenozoic -> Globanomalinidae -> Globanomalina -> Globanomalina australiformis
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_pl33_f07.jpg
Olsson_etal_99_pl33_f10-11 13.jpg
Olsson_etal_99_pl33_f01-2_f06.jpg
Olsson_etal_99_pl33_f03-4.jpg
Olsson_etal_99_pl33_f08-9.jpg

Taxonomy

Citation: Globanomalina australiformis (Jenkins 1966)

Taxonomic rank: species

Basionym: Globorotalia australiformis

Synonyms:

Globorotalia australiformis Jenkins, 1965:1112, fig. 11:92-96 [lower Eocene, Waipawan Stage, Middle Waipawan River section, New Zealand],— Ludbrook and Lindsay, 1969:367, pl. 1: figs. 4, 5 [middle Eocene, South Australia],
Planorotalites australiformis (Jenkins). —Tjalsma, 1977:495, pl. 2:figs.10-12 [lower Eocene, DSDP Site 329/32/1: 141-143 cm], fig. 13, [upper Paleocene, DSDP Site 329/33/1: 125-127 cm; Maurice Ewing Bank, South Atlantic Ocean].—Jenkins, 1985:279,fig.6.8 [holotype refigured].—Huber, 1991b:440, pl. 6: figs. 17, 18 [Zone AP5, uppermost Paleocene, ODP Hole 738B/23X: 196.93 msbf; Kerguelen Plateau, southern Indian Ocean].
Globorotalia (Planorotalites) australiformis Jenkins in Hornibrook, Brazier, and Strong, 1989:128:fig.24:15a-c [holotype refigured]. [Olsson et al. 1999]

Taxonomic discussion: The original description of this species by light microscope indicated a smooth, finely perforate wall, but SEM micrographs show a fine coating of pustule-like calcite covering the original wall. It is possible that this coating is of gametogenetic origin, but this possibility needs more study. The species has been reported only in southern latitude sites and may be biogeographically restricted. Blow (1979) suggested that G. australiformis may be a cool-water endemic form of the tropical Globorotalia troelseni Loeblich and Tappan morphotype due to its general morphologic similarity. Globorotalia troelseni (= G. chapmani Parr, 1938) is a 5-chambered species and does not possess the dense pustulose wall surface of G. australiformis. It would appear that G. australiformis arose independently as an endemic species in the southern high latitudes. Blow also placed specimens identified as Globorotalia elongata Glaessner, 1937a, by Loeblich and Tappan (1957a) from the Vincentown Formation of New Jersey and from the Velasco Shale of Mexico in synonymy with G. australiformis. Those specimens belong to G. chapmani. [Olsson et al. 1999]

Catalog entries: Globorotalia australiformis

Type images:

holotype: G. australiformis
holotype: G. australiformis
paratype: G. australiformis

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 small. Final whorl with 4 low conical chambers and an acute axial periphery. Axial periphery imperforate, becoming thickened on the last chambers.

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: Lobate chamber arrangement: Trochospiral edge view: Inequally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Inflated coiling axis: Low periphery: N/A aperture border: Thick 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: 4-4 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Southern middle to high latitudes (Figure 16). [Olsson et al. 1999]
Aze et al. 2011 summary: Southern middle to high latitudes; based on Olsson et al. (1999)

Isotope paleobiology

No data available. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 3 - Open ocean thermocline; based on comparison with other species of the genus.

Phylogenetic relations

The origin of this species has not been traced. Jenkins (1965) notes that australiformis is closely related to many Paleocene smooth-walled species (of Globanomalina) and that it replaces G. pseudomenardii Bolli, 1957a, in the lower part of the Waipawan Stage. It would appear more closely related to G. imitata in having 4-4_ (mostly 4) chambers in the final whorl and in the dense pustulose wall surface observed in early chambers of this species (see Plate 4: Figures 12, 13, 16; Plate 36: Figures 8, 12). [Olsson et al. 1999]

Most likely ancestor: Globanomalina imitata - at confidence level 4 (out of 5). Data source: Olsson & Hemleben 2006, fig14.1.
Likely descendants: Turborotalia frontosa; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Lower part of Waipawan Stage to the Porangan Stage; upper Subbotina triloculinoides Zone to the P. primitiva Zone (upper Paleocene to lower Eocene). [Olsson et al. 1999]
Last occurrence (top): in upper part of E9 zone (80% up, 43.4Ma, in Lutetian stage). Data source: Olsson & Hemleben 2006, fig14.1
First occurrence (base): near base of P5 zone (10% up, 57Ma, in Thanetian 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 australiformis, synonyms included - Globanomalina australiformis; Globorotalia australiformis; Planorotalites australiformis; Planorotalites australiformis (q);
See also space-time plot :: Samples map :: Parent: Globanomalina

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 38

References:

Glaessner, M. F. (1937a). Planktonforaminiferen aus der Kreide und dem Eozän und ihre stratigraphische Bedeutung. Etyudy po Mikropaleontologiy, Paleontologicheskaya Laboratoriya Moskovskogo Gosudarstvennogo Universiteta. 1(1): 27-46. gs

Jenkins, D. G. (1966b). Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. New Zealand Journal of Geology and Geophysics. 8 [1965](6): 1088-1126. 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. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

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. gs

Toumarkine, M. & Luterbacher, H. (1985). Paleocene and Eocene planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge Univ. Press, Cambridge 87-154. gs

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

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=100096 Go to Archive.is to create a permanent copy of this page - citation notes

Add Comment

Comments

No comments yet. Be the first!

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	Thick 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:	4-4	N.B. These characters are used for advanced search. N/A - not applicable