Chiloguembelina subtriangularis


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

Taxonomy

Citation: Chiloguembelina subtriangularis Beckmann 1957
Rank: Species
Basionym: Chiloguembelina subtriangularis
Synonyms:
Taxonomic discussion: This species is easily distinguished from other chiloguembelinids by its subtriangular test with a subangular periphery. [Olsson et al. 1999]

Catalog entries: Chiloguembelina subtriangularis;

Type images:

Short diagnosis: Test small, biserial with a subangular periphery, subtriangular in side view. Chambers increasing nearly twice as rapidly in breadth than in height, slightly inflated, successive chambers slightly overlapping the previous chambers, sutures somewhat depressed and nearly straight, forming a low angle with the growth axis. Aperture a low, asymmetrically positioned, interiomarginal arch surrounded by a lip that narrows toward the center of the chamber. Length 140-220 um.

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: Test small, biserial with a subangular periphery, subtriangular in side view. Chambers increasing nearly twice as rapidly in breadth than in height, slightly inflated, successive chambers slightly overlapping the previous chambers, sutures somewhat depressed and nearly straight, forming a low angle with the growth axis. Aperture a low, asymmetrically positioned, interiomarginal arch surrounded by a lip that narrows toward the center of the chamber. Length 140-220 um. [Olsson et al. 1999]

Character matrix

test outline:Triangularcoiling axis:N/Achamber arrangement:Biserialumbilicus:N/A
edge view:Compressedumbilical or test sutures:Weakly depressedspiral sutures:N/Ashell porosity:-
wall texture:Smoothaperture:Terminalaperture border:Thin lipaccessory apertures:-
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:N/Aperiph margin shape:Subangular
umb depth:N/Adiameter mm:width mm:-breadth mm:-
final-whorl chambers:2.0-2.0

Biogeography and Palaeobiology


Geographic distribution: Reported from the low to middle
latitudes worldwide. [Olsson et al. 1999]

Isotope paleobiology: No data available. [Olsson et al. 1999]

Phylogenetic relations: Beckmann (1957) suggested that C.
subtriangularis descended from C. midwayensis during the Paleocene. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Zone Pic to Zone P3. [Olsson et al. 1999]
Last occurrence (top): within P3 zone (60.73-62.29Ma, top in Selandian stage). Data source: Olsson et al. 1999
First occurrence (base): within P1c subzone (62.60-63.90Ma, base in Danian 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:

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.


Chiloguembelina subtriangularis compiled by the pforams@mikrotax project team viewed: 29-5-2017

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