Clavigerinella colombiana


Classification: pf_cenozoic -> Hantkeninidae -> Clavigerinella -> Clavigerinella colombiana
Sister taxa: C. akersi, C. caucasica, C. colombiana, C. eocanica, C. jarvisi, C. sp.

Taxonomy

Citation: Clavigerinella colombiana (Petters 1954)
Rank: Species
Basionym: Hastigerinella colombiana
Synonyms:
Taxonomic discussion: Complete specimens are very rare; the holotype illustrated by Petters, and shown here in SEM for the first time, is one of very few that has been isolated more or less intact. The species is usually identified by the isolated, paddle-shaped chambers. A few complete species have been reported from the western equatorial Atlantic (Demerara Rise) (P. Sexton, pers. comm., 2004). [Coxall & Pearson 2006]

Catalog entries: Hastigerinella colombiana

Type images:

Distinguishing features: Final chambers paddlewheel-like, i.e. flattened in side view, sub-triangular in edge view

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


Wall type: Uncertain because all the specimens we have examined are poorly preserved; it may have a higher pore density than is typical of the genus. [Coxall & Pearson 2006]

Size: Maximum diameter of holotype 0.66 mm; minimum diameter 0.51 mm; maximum thickness (at periphery) 0.40 mm; minimum thickness (near umbilicus) 0.15 mm (Petters, 1954). Specimens reach up to 1 mm in diameter. [Coxall & Pearson 2006]

Character matrix

test outline:Lobatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:N/Acoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:N/Aumb depth:Shallowwall texture:shell porosity:
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Apparently worldwide, most common in continental margin settings and the equatorial Pacific. Not found in open-ocean oligotrophic assemblages. It was originally described from the same sample as Pseudoglobigerinella bolivariana. Blow’s (1979) comment that this species is particularly common in the Indo-Pacific region has not been substantiated. [Coxall & Pearson 2006]
Aze et al. 2011 summary: Cosmopolitan on continental shelf settings; based on Coxall & Pearson (2006)

Isotope paleobiology: Clavigerinella colombiana registers high ∂18O and low ∂13C compared to other co-occurring planktonic species, indicating that it lived in a cold, 12C-rich water mass (Coxall, 2000). [Coxall & Pearson 2006]
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light δ13C and very heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Coxall et al. (2000)

Phylogenetic relations: The evolutionary relationships of C. colombiana to other clavigerinellids is difficult to establish because of its sporadic occurrence. It probably evolved from C. eocanica in the latest early Eocene (E7) by lateral widening and flattening of the chambers in the direction of coiling. [Coxall & Pearson 2006]

Most likely ancestor: Clavigerinella eocanica - at confidence level 3 (out of 5). Data source: Coxall & Pearson (2006), fig 8.1.

Biostratigraphic distribution

Geological Range:
Notes: Uppermost Zone E7-E10 (poorly constrained).
[Coxall & Pearson 2006]
Last occurrence (top): at top of E10 zone (100% up, 41.9Ma, in Lutetian stage). Data source: Coxall & Pearson (2006), fig 8.1
First occurrence (base): in upper part of E7a subzone (80% up, 48.7Ma, in Ypresian stage). Data source: Coxall & Pearson (2006), fig 8.1

Plot of occurrence data:

Primary source for this page: Coxall & Pearson 2006 - Eocene Atlas, chap. 8, p. 221

References:

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Coxall, H. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of the Hantkeninidae (Clavigerinella, Hantkenina and Cribrohantkenina). 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 8): 213-256. gs V O

Coxall, H. K. (2000). Hantkeninid planktonic foraminifera and Eocene palaeoceanographic change. In, p264 (ed.) . PhD thesis, University of Bristol 1-264. gs

Petters, V. (1954). Tertiary and Upper Cretaceous foraminifera from Colombia, S. A. Contributions from the Cushman Foundation for Foraminiferal Research. 5(1): 37-41. gs V O

Weiss, L. (1955b). Planktonic index foraminifera of northwestern Peru. Micropaleontology. 1: 301-319. gs


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Clavigerinella colombiana compiled by the pforams@mikrotax project team viewed: 28-10-2020

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