Globigerinatheka barri


Classification: pf_cenozoic -> spinose -> Globigerinidae -> Globigerinatheka -> Globigerinatheka barri
Sister taxa: G. barri, G. curryi, G. euganea, G. index, G. korotkovi, G. kugleri, G. luterbacheri, G. mexicana, G. semiinvoluta, G. subconglobata, G. tropicalis,

Taxonomy

Citation: Globigerinatheka barri Bronnimann 1952
Rank: Species
Basionym: Globigerinatheka barri
Synonyms:
Taxonomic discussion: In the original drawings of Globigerinatheka barri Bronnimann (1952) the specimen in text-figs. 3d-f does not have bullae, and is more consistent with G. kugleri. Bolli (1972) reported that G. barri is “almost identical” with G. mexicana except for the lack of bullae in the latter. For this reason, he considered barri as a subspecies of G. mexicana. However, as reported above, and in agreement with Blow (1979), G. barri differs from G. mexicana in having a shorter, slightly higher initial spire, sutures that are more depressed and a smaller flatter last chamber.
The specimen identified by Samanta (1970, pl. 2, fig. 16) as G. index shows a coiling mode that is close to that of G. barri, to which it is here attributed, even though it is devoid of bullae. [Premoli Silva et al. 2006]

Catalog entries: Globigerinatheka barri;

Type images:

Short diagnosis: Globigerinatheka barri is characterized by its numerous secondary apertures with bullae. It differs from G. mexicana in having fewer chambers in the first whorl which are arranged in a slightly higher trochospire, more depressed sutures throughout the test, and a smaller flatter last chamber which occupies a maximum of one third of the entire test (instead of half of it, as in G. mexicana). Even
though several features, like the secondary apertures, are masked by numerous bullae, G. barri differs from G. kugleri in having the test nearly globular instead of roughly subtriangular, a less lobate and more compact outline, subcircular apertures instead of rather wide low arches, and common bullae with subcircular accessory apertures.

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: Globigerinatheka barri is characterized by its numerous secondary apertures with bullae. It differs from G. mexicana in having fewer chambers in the first whorl which are arranged in a slightly higher trochospire, more depressed sutures throughout the test, and a smaller flatter last chamber which occupies a maximum of one third of the entire test (instead of half of it, as in G. mexicana). Even
though several features, like the secondary apertures, are masked by numerous bullae, G. barri differs from G. kugleri in having the test nearly globular instead of roughly subtriangular, a less lobate and more compact outline, subcircular apertures instead of rather wide low arches, and common bullae with subcircular accessory apertures. [Premoli Silva et al. 2006]

Wall type: Spinose, cancellate; commonly covered by a thick calcite crust. [Premoli Silva et al. 2006]

Test morphology: Subglobular to globular, early chambers in low trochospiral as in Globigerina, later chambers more or less streptospirally coiled, with the larger last chambers tending to envelop the previous whorls and the final chamber frequently enveloping and covering the umbilical area formed by the previous chambers. Sutures depressed, radial. Primary aperture in the early globigerinid stage interiomarginal, umbilical, in later stage single primary aperture may be replaced by multiple, arched, sutural apertures. In the enveloping, final chamber one or more secondary sutural apertures may or may not be covered by bullae of varying size. Each bulla possesses one or more small infralaminal accessory apertures. [Premoli Silva et al. 2006]

Character matrix

test outline:Circularcoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Narrow
edge view:Equally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Macroperforate: >2.5
wall texture:Spinoseaperture:Umbilicalaperture border:N/Aaccessory apertures:Sutural
periphery:N/Aumb chamber shape:Globularsp chbr shape:Globularperiph margin shape:Broadly rounded
umb depth:Deepdiameter mm:width mm:breadth mm:
final-whorl chambers:4.0-5.0

Biogeography and Palaeobiology


Geographic distribution: Common in low and middle latitudes. [Premoli Silva et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Premoli Silva et al. (2006)

Isotope paleobiology: No data available. [Premoli Silva 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): this study

Phylogenetic relations: Saito (1962) and Bolli (1972) suggested that G. barri may have evolved from G. subconglobata. However, Bolli (1972, p. 114) in the reconstruction of the globigerinathekid phylogenetic tree proposed mexicana as ancestral to barri, from which he suggested kugleri evolved; this relationship is rejected here.
[Premoli Silva et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: G. barri is confined mainly to the middle Eocene, appearing in the mid-part of Zone E9 and extending up almost to the top of Zone E14. [Premoli Silva et al. 2006]
Last occurrence (top): within E14 zone (35.89-37.99Ma, top in Priabonian 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: Premoli Silva et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 7, p. 177

References:

Baumann, P., (1970). Mikropalaentologische und stratigraphische Untersuchungen der obereozaenen-oligozaenen Scaglia im zentralen Apennin (Italien). Eclogae Geologicae Helvetiae, 63: 1133-1211.

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.

Bolli, H.M., (1957). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 155-172.

Bolli, H.M., (1972). The genus Globigerinatheka Bronnimann. Journal of Foraminiferal Research, 2(3): 109-136.

Bolli, H.M.; Loeblich, A.R., Jr. & Tappan, H., (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, DC, pp. 3-50.

Brönnimann, P., (1952). Globigerinoita and Globigerinatheka, new genera from the Tertiary of Trinidad, B.W.I. Cushman Foundation for Foraminiferal Research, Special Publication, 3(1): 25-28.

Cushman, J.A., (1925). New foraminifera from the Upper Eocene of Mexico. Contributions from the Cushman Foundation for Foraminiferal Reseach, 1(1): 4-9.

Eckert, H.R., (1963). Die obereeozaen Globigerinen-Schiefer (Stadund Schimbergerschiefer) zwischen Pilatus und Schrattenfluh. Eclogae Geologicae Helvetiae, 56: 1001- 1072.

Finlay, H.J., (1939). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand, 69(1): 89-128.

Huber, B.T., (1991). Paleogene and early Neogene planktonic foraminifer biostratigraphy of ODP Leg 119 Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results, 119: 427-449.

Jenkins, D.G., (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin, 42: 1-278.

Loeblich, A.R., Jr. & Tappan, H., (1957). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 173-198.

Mohan, M. & Soodan, K.S., (1970). Middle Eocene planktonic foraminiferal zonation of Kutch, India. Micropaleontology, 16: 37-46.

Nishi, H. & Chaproniere, G.C.H., (1994). Eocene-Oligocene subtropical planktonic foraminifers at Site 841,. Proceedings of the Ocean Drilling Program, Scientifc Results, 135: 245-266.

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Premoli Silva, I.; Wade, B.S. & Pearson, P.N., (2006). Taxonomy, biostratigraphy, and phylogeny of Globigerinatheka and Orbulinoides. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 169-212.

Pujol, C., (1983). Cenozoic planktonic foraminiferal biostratigraphy of the South-Western Atlantic (Rio Grande Rise): Deep Sea Drilling Project Leg 72. Initial Reports of the Deep Sea Drilling Project, 72: 623-673.

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Snyder, S.W. & Waters, V.J., (1985). Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur Region, Deep Sea Drilling Project Leg 80. Initial Reports of the Deep Sea Drilling Project, 80: 439-472.

Stainforth, R.M.; Lamb, J.L.; Luterbacher, H.; Beard, J.H. & Jeffords, R.M., (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. The University of Kansas Paleontological Contributions, 62: 1-425.

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Toumarkine, M., (1983). Les Foraminifères planctoniques de l’Eocène moyen et supérieur des régions tropicales à temperées chaudes. PhD Thesis, Université Pierre et Marie Curie, Paris 6, 83-05, 1-219 pp.

Warraich, M.Y. & Nishi, H., (2003). Eocene planktic foraminiferal biostratigraphy of the Sulaiman range, Indus Basin, Pakistan. Journal of Foraminiferal Research, 33: 219-236.


Globigerinatheka barri compiled by the pforams@mikrotax project team viewed: 23-6-2017

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