Catalog entries: Chiloguembelina parallela
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 short and thick, tapering rapidly toward its base. Aperture centrally located, symmetrical, high and narrow.
Diagnostic characters:
Morphology:
Wall type:
Size:
Character matrix
test outline: | Subtriangular | chamber arrangement: | Biserial | edge view: | Equally biconvex | aperture: | Interiomarginal |
sp chamber shape: | Globular | coiling axis: | N/A | periphery: | N/A | aperture border: | Thick flange |
umb chbr shape: | Globular | umbilicus: | N/A | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Finely pustulose | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 2-2 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Most likely ancestor: Chiloguembelina trinitatensis - at confidence level 4 (out of 5). Data source: Huber et al. 2006, f16.2.
Geological Range:
Notes: Lower Eocene Zone E3 to middle Zone E4. Beckmann (1957) suggested that C. parallela is a good index marker for the lower Eocene as it has a short range within the Globorotalia rex Zone in the upper Lizard Springs Fm. of Trinidad. [Huber et al. 2006]
Last occurrence (top): in mid part of E4 zone (50% up, 53.6Ma, in Ypresian stage). Data source: Huber et al. 2006, f16.2
First occurrence (base): within E3 zone (54.61-55.20Ma, base in Ypresian stage). Data source: Huber et al. 2006, f16.2
Plot of occurrence data:
Primary source for this page: Huber et al. 2006 - Eocene Atlas, chap. 16, p. 475
Beckmann, J. P. (1957). 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. 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 Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). 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. 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 OReferences:
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Chiloguembelina parallela compiled by the pforams@mikrotax project team viewed: 24-6-2025
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