Guembelitria


Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae -> Guembelitria
Sister taxa: Cassigerinelloita, Globoconusa, Guembelitria, Jenkinsina, Parvularugoglobigerina, Woodringina,
Daughter taxa: (blue => in age window 0-300Ma)
Test small, triserial; chambers globular  with strongly depressed sutures; aperture with a distinct lip and often slightly asymmetric. 
Specimens which cannot be assigned to established species

Taxonomy

Citation: Guembelitria Cushman, 1933
Rank: Genus
Type species: Guembelitria cretacea Cushman, 1933.
Synonyms: Chiloguembelitria Hofker, 1978:60.
Taxonomic discussion: Confusion remains over the taxonomic status of Chiloguembelitria, which Loeblich and Tappan (1988) retained as a valid genus and Kroon and Nederbragt (1990) suggested is a junior synonym of Guembelitria. This confusion is exacerbated by the absence of a designated holotype for Chiloguembelitria or its type species, Chiloguembelitria danica Hofker, 1978. Nonetheless, it appears that no morphological characters consistently distinguish Chiloguembelitria spp. from Guembelitria spp. The original description and illustration of C. danica Hofker, 1978, resembles Guembelitria cretacea Cushman, 1933, in its apertural characteristics and its consistent triseriality (Plate 63). The absence of distinct chiloguembelitriid characters indicates that, as suggested by Kroon and Nederbragt (1990), Chiloguembelitria danica Hofker, 1978, is a junior synonym of Guembelitria cretacea Cushman, 1933. [Olsson et al. 1999]

Catalog entries: Guembelitria;

Type images:

Distinguishing features: Test small and triserial. Aperture bordered by a distinct lip and often slightly asymmetric. Wall structure microperforate; surface texture of well-preserved specimens characterized by presence of pore-mounds.

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: Test small and triserial. Aperture bordered by a distinct lip and often slightly asymmetric. Wall structure microperforate; surface texture of well-preserved specimens characterized by presence of pore-mounds.

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in mid part of Danian Stage (48% up, 63.9Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Maastrichtian Stage (36% up, 69.9Ma, in Maastrichtian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 79

References:

Cushman, J.A., (1933). Some new foraminiferal genera. Contributions from the Cushman Laboratory for Foraminiferal Research, 9(2): 32-38.

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.

Haynes, J.R., (1981). Foraminifera. John Wiley and Sons, New York.

Hofker, J., (1978). Analysis of a large succession of samples through the Upper Maastrichtian and Lower Tertiary of Drill Hole 47.2, Shatsky Rise, Pacific, Deep Sea Drilling Project. Journal of Foraminiferal Research, 8(1): 46-75.

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. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. 41 Allen Press, Lawrence, Kansas, pp. 461-508.

Jenkins, D.G.; Whittaker, J.E. & Curry, D., (1998). Palaeogene triserial planktonic foraminifera. Journal of Micropalaeontology, 17: 61-70.

Kroon, D. & Nederbragt, A.J., (1990). Ecology and paleoecology of triserial planktic foraminifera. Marine Micropaleontology, 16: 25-38.

Loeblich, A.R. & Tappan, H., (1956). Chiloguembelina, a new Tertiary genus of the Heterohelicidae (Foraminifera). Journal of the Washington Academy of Sciences, 46: 340.

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.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology, 85. Smithsonian Institution Press, Washington, DC, 1-252 pp.

Ujiie, Y.; Kimoto, K. & Pawlowski, J., (2008). Molecular evidence for an independent origin of modern triserial planktonic foraminifera from benthic ancestors. Marine Micropaleontology, 69: 334-340.


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Guembelitria compiled by the pforams@mikrotax project team viewed: 22-9-2018

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