pforams@mikrotax - Globoturborotalita martini

Citation: Globoturborotalita martini (Blow and Banner 1962)

Synonyms:

Globigerinita martini martini Blow and Banner, 1962:110, pl. 14, fig. O [upper Eocene Cribrohantkenina danvillensis Zone, Sample FCRM 1932, Lindi area, Tanzania].—Blow, 1979:1340, pl. 24, fig. 5; pl. 245, figs. 5, 6 [upper Eocene Zone E15/16, Red Bluff Clay, type locality, Alabama].
Catapsydrax martini (Blow and Banner).—Warraich and Ogasawara, 2001:45, figs. 12, 15, 16 [Zone E10/11, Kirthar Fm., Sulaiman Range, Pakistan].—Spezzaferri and Premoli Silva, 1991, pl. 1, figs. 5a-c [upper Oligocene Subzone P21b, DSDP Hole 538A, Gulf of Mexico].
Globoturborotalita martini (Blow and Banner).—Olsson and others, 2006:121, pl. 6.2, figs. 14-18 [upper Eocene, Zone E15/E16, Shubuta Clay, Yazoo Fm. Wayne County, Mississippi].—Sexton and others, 2006:6, pl. 1, fig. 3 [middle Eocene Zone E13, ODP Site 1052, Blake Nose, western North Atlantic Ocean].—Miller and others, 2008:fig. 6a [lower Oligocene Zone O1, St Stephens Quarry, Alabama].
Globigerinita martini scandretti Blow and Banner, 1962:111, pl. 14, figs. V-X [lower Oligocene Globigerina oligocaenica Zone, Sample FCRM 1922, Lindi area, Tanzania].—Blow, 1979:1342, pl. 24, figs. 6, 7 [lower Oligocene Zone O2, Sample FCRM 1922, Lindi area, Tanzania]; pl. 245, fig. 7 [lower Oligocene Zone O1, DSDP Site 14, central South Atlantic Ocean].
Globigerinita hardingae Blow, 1979:1338, pl. 178, figs. 1-5 (4 = holotype) [middle Eocene Zone E9, Sample RS. 24, Kilwa area, Tanzania].[Spezzaferri et al. 2018]

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]

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: 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.

Description

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]

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

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

Biogeography and Palaeobiology

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

Recorded (as Globoturborotalita sp.) with the most negative _18O 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 _¹³C and relatively light _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (2001)

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]

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

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., Banner, F. T., Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

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

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gs O

Miller, K. G. et al. (2008). Eocene-Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama. Geological Society of America, Bulletin. 120: 34-53. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 5): 67-110. gs O

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

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

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. gs

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. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 8): 231-268. gs

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. 22: 1-59. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	Thick lip
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Spinose	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

Globoturborotalita martini

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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