Guembelitrioides


Classification: pf_cenozoic -> Globigerinidae -> Guembelitrioides
Sister taxa: Beella, Globigerina, Globigerinella, Protentella, Quiltyella, Ciperoella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Praeorbulina, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita, Dentoglobigerina, Globoquadrina, Catapsydrax, Clavatorella, Paragloborotalia, Protentelloides, Eoglobigerina, Globigerinatheka, Globorotaloides, Guembelitrioides, Orbulinoides, Parasubbotina, Pseudoglobigerinella, Subbotina,
Daughter taxa: (blue => in age window 0-300Ma)
The very high spire, lobate periphery, globular chambers and supplementary apertures typically characterize this species. 
Specimens which cannot be assigned to established species

Taxonomy

Citation: Guembelitrioides El Naggar, 1971
Rank: Genus
Type species: Globigerinoideshigginsi Bolli, 1957; junior synonym of “Globigerinoidesnuttalli Hamilton, 1953
Taxonomic discussion: El-Naggar (1971, p. 450) in his classification of Globigerinacea stated that, in his view, “highly turreted Globigerinoides species, such as
Globigerinoides higginsi Bolli, 1957, are in fact Guembelitrias with developed supplementary apertures. They are related to Guembelitria in the same way as Globigerinoides is related to Globigerina”. However, Guembelitrioides bears no relation to Guembelitria, which is a microperforate nonspinose genus. On the other hand, Bolli (1957b) in describing his species clearly stated that his Globigerinoides higginsi (= nuttalli) had no relationship with Neogene Globigerinoides even though they both shared supplementary apertures. Nevertheless it is useful to recognize the nuttalli (= higginsi) morphology as distinct at the generic level, so El Naggar’s name stands. The genus is monospecific.
Loeblich and Tappan (1961, 1988) included the genus Guembelitriodes in the Family Catapsydracidae. Here we include it in the Family Globigerinidae. [Olsson et al. 2006]

Catalog entries: Guembelitrioides;

Type images:

Distinguishing features: Like Subbotina gortanii group but with supplementary sutural apertures.

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: Guembelitrioides is distinguished from the high-spired Subbotina gortanii group by the presence of supplementary sutural apertures in most specimens. The two are also separated by a gap in their stratigraphic ranges. As described by Blow (1979), in both general morphology and wall ultrastructure Guembelitrioides is closely similar to the modern genus Globigerinoides but is an unrelated homeomorph.
[Olsson et al. 2006]

Wall type: Spinose, high porosity cancellate sacculifer type wall texture, pore diameter 5 µm. [Olsson et al. 2006]

Test morphology: Test trochospiral, globigerini-form, high spired becoming helicospiral with ontogeny; chambers subspherical, loosely attached in final whorl(s); sutures radial, moderately to strongly depressed; periphery distinctly lobate; primary aperture arched, umbilical, at least one supplementary aperture
is usually present on the spiral side of the final whorl.
[Olsson et al. 2006]

Biogeography and Palaeobiology

Most likely ancestor: Parasubbotina - at confidence level 0 (out of 5). Data source: .
Likely descendants: Globigerinatheka;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near top of Lutetian Stage (89% up, 41.9Ma, in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Lutetian Stage (32% up, 45.7Ma, in Lutetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Eocene Atlas, chap. 5, p. 84

References:

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.

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.

El-Naggar, Z.R., (1971). On the classification, evolution and stratigraphical distribution of the Globigerinacea. In: Farinacci, A. (Editor), Proceedings of the II Planktonic Conference, Roma 1970. Edizioni Tecnoscienza, Rome, pp. 421-476.

Hamilton, E.L., (1953). Upper Cretaceous, Tertiary, and Recent planktonic foraminifera from mid-Pacific flat-topped seamounts. Journal of Paleontology, 27(2): 204-237.

Loeblich, A.R. & Tappan, H., (1961). Cretaceous planktonic foraminifera: Part I-Cenomanian. Micropaleontology, 7: 257-304.

Loeblich, A.R. & Tappan, H., (1988). Foraminiferal Genera and Their Classification (Volume I-II)Van Nostrand Reinhold Co., New York, 1059 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 Allen Press, Lawrence, Kansas, pp. 67-110.


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Guembelitrioides compiled by the pforams@mikrotax project team viewed: 16-12-2018

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