Globoturborotalita martini


Classification: pf_cenozoic -> spinose -> Globigerinidae -> Globoturborotalita -> Globoturborotalita martini
Sister taxa: G. anguliofficinalis, G. barbula, G. bassriverensis, G. gnaucki, G. martini, G. ouachitaensis, G. sp.,

Taxonomy

Citation: Globoturborotalita martini (Blow and Banner 1962)
Rank: Species
Basionym: Globigerinita martini
Synonyms:
Taxonomic discussion: Blow (1979) noted the close morphological similarity between Globigerinita (vel Globoturborotalita) martini martini and his new species Globigerinita (vel Globoturborotalita) hardingae and regarded the two species as probably phylogenetically related. He emphasized the coarsely cancellate wall texture present in each species but separated G. hardingae from G. martini on the basis of a slower increase in chamber size, a smaller ultimate chamber (referred to as a bulla by Blow), and a more coarsely cancellate wall texture in G. hardingae. However, these morphologic features are here regarded as a difference in degree rather than kind. In fact, the SEM images of the holotype of G. martini (Pl.6.2, Figs. 8-11) show no discernible difference in the coarseness of the cancellate structure between the two morphotypes. The wall texture of G. martini (Pl.6.2, Fig. 11) is a typical Globoturborotalita wall texture.
Morphological differences between the two subspecies of G. martini erected by Blow and Banner are not regarded here as sufficient to warrant the separation of the two morphotypes as subspecies. [Olsson et al. 2006]

Catalog entries: Globigerinita martini;
Globorotalia martini scandretti;

Type images:

Short diagnosis: The species is characterized by its small size, 4 globular, slightly embracing, chambers in the ultimate whorl and the reduced ultimate chamber that extends over and partially covers the umbilicus, and a cancellate sacculifer-type, spinose wall texture.

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 species is characterized by its small size, 4 globular, slightly embracing, chambers in the ultimate whorl and the reduced ultimate chamber that extends over and partially covers the umbilicus, and a cancellate sacculifer-type, spinose wall texture. [Olsson et al. 2006]

Wall type: Cancellate, normal perforate, spinose, ruber-type wall structure. [Olsson et al. 2006]

Test morphology: Test small, moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 4 globular, slightly embracing chambers in ultimate whorl, increasing rapidly in size, sutures depressed, straight; in umbilical view 4 globular, slightly embracing chambers, increasing rapidly in size, final chamber reduced in size extending over and partially covering the umbilicus, sutures depressed, straight, umbilicus small, partially covered by the ultimate chamber, aperture umbilical, a rounded arch, bordered by thickened rim; in edge view chambers globular in shape, slightly embracing. [Olsson et al. 2006]

Size: Maximum diameter of holotype 0.32 mm, thickness 0.22 mm. [Olsson et al. 2006]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
umb chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Strongly depressedumb depth:Deepwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Strongly depresseddiameter mm:0.32width mm:breadth mm:0.22
final-whorl chambers:4.0-4.0

Biogeography and Palaeobiology


Geographic distribution: Distributed in mid to low latitudes. [Olsson et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (2006a)

Isotope paleobiology: Recorded (as Globoturborotalita sp.) with the most negative ∂18O of an upper Eocene assemblage from Tanzania by Pearson and others (2001), indicating a shallow, warm water habitat. [Olsson et al. 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (2001a)

Phylogenetic relations: The derivation of Globoturborotalita martini is probably from Globoturborotalita bassriverensis n. sp., and may represent an intermediate morphology between four and five chambered species in the radiation of Globoturborotalita in the Eocene. [Olsson et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Zone E9 to Zone O2/ O3. [Olsson et al. 2006]
Last occurrence (top): within O3 zone (29.18-30.28Ma, top in Rupelian stage). Data source: Eocene Atlas
First occurrence (base): within E9 zone (43.23-43.85Ma, base in Lutetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 6, p. 121

References:

Blow, W.H. & Banner, F.T., (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In: Eames, F.E. et al. (Editors), Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge, pp. 61-151.

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.

Olsson, R.K.; Pearson, P.N. & Huber, B.T., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. Allen Press, Lawrence, Kansas, pp. 67-110.

Warraich, M.Y. & Ogasawara, K., (2001). Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan. Science Reports of the Institute of Geosciences, University of Tsukuba, Section B = Geological Sciences, 22: 1-59.


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Globoturborotalita martini compiled by the pforams@mikrotax project team viewed: 21-10-2017

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