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Chiloguembelina trinitatensis


Classification: pf_cenozoic -> Guembelitrioidea -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina trinitatensis
Sister taxa: C. adriatica, C. cubensis, C. andreae, C. ototara ⟩⟨ C. parallela, C. trinitatensis, C. wilcoxensis, C. crinita ⟩⟨ C. subtriangularis, C. midwayensis, C. morsei, C. sp.

Taxonomy

Citation: Chiloguembelina trinitatensis (Cushman&Renz 1942)
Taxonomic 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:

Distinguishing features:
Parent taxon (Chiloguembelina): Test subtriangular in outline, biserial throughout or rarely with multiserial final chambers; aperture a simple arched opening at base of the final chamber, with a narrow rim on one margin and a broad collar or flange directed toward one of the flat sides of the test, lacking an infolded margin or internal plate. Rarely with multiple apertures.
This taxon: Test biserial with chambers that increase uniformly in breadth and height. Aperture symmetrically centered, low-arched with a narrow, equidimensional lip.

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

Character matrix
test outline:Triangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:2-2 N.B. These characters are used for advanced search. N/A - not applicable

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]

Most likely ancestor: Chiloguembelina wilcoxensis - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, f6.
Likely descendants: Chiloguembelina parallela; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Upper Paleocene Zone P5 to lower Eocene Zone E3 (upper part).
Last occurrence (top): in mid part of E3 zone (50% up, 54.9Ma, in Ypresian stage). Data source: Huber et al. 2006, f16.2
First occurrence (base): within P5 zone (55.96-57.10Ma, base in Thanetian stage). Data source: Huber et al. 2006, f16.2

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. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 83-95. gs

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

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., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gs O

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

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. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

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Chiloguembelina trinitatensis compiled by the pforams@mikrotax project team viewed: 17-1-2025

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