Chiloguembelina trinitatensis


Classification: pf_cenozoic -> microperforate -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina trinitatensis
Sister taxa: C. crinita, C. cubensis, C. midwayensis, C. morsei, C. ototara, C. parallela, C. subtriangularis, C. trinitatensis, C. wilcoxensis, C. sp.,

Taxonomy

Citation: Chiloguembelina trinitatensis (Cushman and Renz 1942)
Rank: Species
Basionym: Guembelina trinitatensis
Synonyms:
Taxonomic discussion: The holotype of this species differs from C. crinita by having an aperture that is symmetrically positioned on the chamber face, and it differs from C. wilcoxensis by its smaller size and slower, more continuous chamber size increase. The holotype has been extensively recrystallized so the primary wall texture is difficult to discern. [Olsson et al. 1999]

Catalog entries: Guembelina trinitatensis;

Type images:

Short diagnosis: Distinguished by its biserial test with chambers that increase uniformly in breadth and height, and the symmetrically centered, low-arched aperture which is surrounded by a narrow, equidimensional lip. [Olsson et al. 1999]

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: Distinguished by its biserial test with chambers that increase uniformly in breadth and height, and the symmetrically centered, low-arched aperture which is surrounded by a narrow, equidimensional lip.

Character matrix

test outline:Triangularcoiling axis:N/Achamber arrangement:Biserialumbilicus:N/A
edge view:Compressedumbilical or test sutures:Strongly depressedspiral sutures:N/Ashell porosity:-
wall texture:Smoothaperture:Terminalaperture border:Thin lipaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:N/Aperiph margin shape:Narrowly rounded
umb depth:N/Adiameter mm:0.27width mm:0.2breadth mm:0.15
final-whorl chambers:2.0-2.0

Biogeography and Palaeobiology


Phylogenetic relations: Beckmann (1957) suggested that C. trinitatensis descended from C. crinita during the Paleocene, but see discussion under C. wilcoxensis. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Upper Paleocene Zone P5 to lower Eocene Zone E3 (upper part).
Last occurrence (top): within E3 zone (54.61-55.20Ma, top in Ypresian stage). Data source: Olsson et al. 1999
First occurrence (base): within P5 zone (55.96-57.10Ma, base in Thanetian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 92

References:

Beckmann, J.P., (1957). Chiloguembelina Loeblich and Tappan and related foraminifera from the Lower Tertiay of Trinidad, B.W.I. . Bulletin of the United States National Museum, 215: 83-95.

Cushman, J.A. & Renz, H.H., (1942). Eocene, Midway, foraminifera from Soldado Rock, Trinidad. Contributions from the Cushman Laboratory for Foraminiferal Research, 18: 1-14.

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

McGowran, B.J., (1965). Two Paleocene foraminiferal faunas from the Wangerrip Group, Pebble Point Coastal Section, Western Australia. Proceedings of the Royal Society of Victoria, 79: 9-74.

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


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Chiloguembelina trinitatensis compiled by the pforams@mikrotax project team viewed: 23-7-2017

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