Globigerinatheka curryi


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

Taxonomy

Citation: Globigerinatheka curryi Proto Decima and Bolli 1970
Rank: Species
Basionym: Globigerinatheka curryi
Synonyms:
Taxonomic discussion: The holotype of G. curryi was previously included by Bolli (1957) in G. kugleri, from which species, according to Proto Decima and Bolli (1970), it differs by its distinctly larger size, more robust wall and more restricted range. The specimens identified by Blow (1979) on his pl. 186, fig. 5 and pl. 192, figs. 2 and 3 as G. kugleri euganea are here included in G. curryi due to their subtriangular outline and the few supplementary apertures. [Premoli Silva et al. 2006]

Catalog entries: Globigerinatheka curryi;

Type images:

Short diagnosis: Globigerinatheka curryi is loosely coiled with deeply incised sutures and inflated chambers. It differs from G. kugleri by its longer initial spire with more numerous chambers and larger size; it differs from G. euganea by its shorter inner spire with fewer chambers, less numerous secondary apertures, less globular general shape, more moderate size of the last chambers and more distinct and depressed sutures especially in the outer whorl. Globigerinatheka curryi is morphologically close to G. luterbacheri from which it differs in having a lower spire resulting in a shape that is more subglobular.

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 curryi is loosely coiled with deeply incised sutures and inflated chambers. It differs from G. kugleri by its longer initial spire with more numerous chambers and larger size; it differs from G. euganea by its shorter inner spire with fewer chambers, less numerous secondary apertures, less globular general shape, more moderate size of the last chambers and more distinct and depressed sutures especially in the outer whorl. Globigerinatheka curryi is morphologically close to G. luterbacheri from which it differs in having a lower spire resulting in a shape that is more subglobular. [Premoli Silva et al. 2006]

Wall type: Spinose, cancellate with pores about 8 µm in diameter. [Premoli Silva et al. 2006]

Test morphology: Test subglobular, with a subtriangular equatorial outline, two and a half whorls, inner spire low, composed of 6 to 7 small chambers increasing slowly in size as added, then increasing much faster becoming subspherical in the second whorl; 3 chambers in the last whorl, rapidly increasing with the penultimate chamber twice as large as the antepenultimate chamber, chambers globular except for the last which is hemispherical and appears smaller in spiral view due to its flattened shape. Coiling from low trochospiral to streptospiral with final few chambers covering previous whorl; sutures distinct even in the inner whorls, becoming progressively more depressed in the final stage. Primary aperture in the adult a low umbilical arch, two secondary low arched sutural apertures at the base of the last chamber above the sutures between the earlier chambers. [Premoli Silva et al. 2006]

Size: Greatest diameter of holotype 0.56 mm. [Premoli Silva et al. 2006]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Interiomarginal
umb chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:N/A
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Umbilical
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5
spiral sutures:Moderately depresseddiameter mm:0.56width mm:breadth mm:
final-whorl chambers:3.0-3.0

Biogeography and Palaeobiology


Geographic distribution: This species is present in tropical to temperate regions, with large specimens only in tropical regions. [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: Bolli (1972) considered both G. curryi and G. euganea as subspecies of G. subconglobata, although he also considered G. curryi to belong to the lineage leading to Orbulinoides beckmanni via G. euganea. In our opinion, G. curryi may have evolved from G. kugleri by decreasing the initial spire and number of chambers in final whorl, and thereby increasing chamber compaction. [Premoli Silva et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: This taxon has a short range from the middle part of Zone E9 to just above the base of Zone E11. [Premoli Silva et al. 2006]
Last occurrence (top): within E11 zone (40.40-41.89Ma, top in Bartonian 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. 179

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., (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.

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.

Fleisher, R.L., (1974). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project, 23: 1001-1072.

Loeblich, A.R. & Tappan, H., (1957). Woodringina, a new foraminiferal genus (Heterohelicidae) from the Paleocene of Alabama. Journal of the Washington Academy of Sciences., 47: 39-40.

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.

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.

Proto Decima, F. & Bolli, H.M., (1970). Evolution and variability of Orbulinoides beckmanni (Saito). Eclogae Geologicae Helvetiae, 63(3): 883-905.

Todd 1966 [sorry, not in our bibliography yet]

Toumarkine, M., (1975). Middle and Late Eocene planktonic foraminifera from the northwestern Pacific Ocean: Leg 32 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project, 32: 735-751.

Toumarkine, M., (1978). Planktonic foraminiferal biostratigraphy of the Paleogene of Sites 360 to 364 and the Neogene of Sites 362A, 363 and 364 Leg 40,. Initial Reports of the Deep Sea Drilling Project, 40: 679-721.

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.


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Globigerinatheka curryi compiled by the pforams@mikrotax project team viewed: 23-8-2017

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