Globoturborotalita martini


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita martini
Sister taxa: G. tenella, G. rubescens, G. decoraperta, G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi, G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides, G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, 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 hardingae;
Globigerinita martini; Globigerinita martini scandretti;

Type images:

Distinguishing features: Test small, 4 globular, slightly embracing, chambers in final whorl, reduced final chamber extends over and partially covers the umbilicus. Wall texture, spinose, cancellate sacculifer-type.

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


Diagnostic characters:

This species is distinguished from the other species belonging to Globoturborotalita by its small size, 4 globular slightly embracing chambers in the last whorl and by the reduced last chamber that extends over and partially covers the umbilicus. [Spezzaferri et al. 2018]


Wall type: Normal perforate, cancellate, spinose, ruber/sacculifer-type wall texture, an average of around 20 pores/50 μm2 test surface area. [Spezzaferri et al. 2018]

Test morphology: Test small, moderately low trochospiral, consisting of 3 whorls, 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. [Spezzaferri et al. 2018]

Size: Holotype maximum diameter 0.22 mm. [Spezzaferri et al. 2018]

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 depressedfinal-whorl chambers:4.0-4.0

Biogeography and Palaeobiology


Geographic distribution: Distributed in mid to low latitudes. [Spezzaferri et al. 2018]

Isotope paleobiology: Recorded (as Globoturborotalita sp.) with the most negative δ18O of an upper Eocene assemblage from Tanzania by Pearson et al. (2001), indicating a shallow, warm water habitat. Sexton and others (2006) suggest that G. martini, inhabited the mixed-layer during winter months. [Spezzaferri et al. 2018]
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. (2001)

Phylogenetic relations: Globoturborotalita martini is believed to have evolved from Globoturborotalita bassriverensis in Zone E9 (Olsson and others, 2006) and may represent an intermediate morphology between four and five chambered species in the radiation of Globoturborotalita in the Eocene. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita bassriverensis - at confidence level 4 (out of 5). Data source: Olsson et al. 2006, f5.1.

Biostratigraphic distribution

Geological Range:
Notes: The distribution of this species ranges from Zone E9 (Olsson and others, 2006) to Zone O5 (Spezzaferri and Premoli Silva, 1991). [Spezzaferri et al. 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Spezzaferri et al. 2018
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: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.252; Olsson et al. 2006 - Eocene Atlas, chap. 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), 2. E. J. Brill, Leiden, 1413 pp.

Miller, K.G.; Browning, J.V.; Aubry, M.-P.; Wade, B.S.; Katz, M.E.; Kulpecz, A.A. & Wright, J.D., (2008). Eocene-Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama. Geological Society of America, Bulletin, 120: 34-53.

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 Allen Press, Lawrence, Kansas, pp. 67-110.

Pearson, P.N. & others, (2001). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature, 413: 481-487.

Sexton, P.E.; Wilson, P.A. & Pearson, P.N., (2006). Palaeoecology of late middle Eocene planktic foraminifera and evolutionary implications. Marine Micropaleontology, 60: 1-16.

Spezzaferri, S. & Premoli Silva, I., (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography, Palaeoclimatology, Palaeoecology, 83: 217-263.

Spezzaferri, S.; Olsson, R.K.; Hemleben, C.; Wade, B.S. & Coxall, H.K., (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In: Wade, B.S. et al. (Editors), Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research Special Pulbication. 46, pp. 231-269.

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: 15-12-2018

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