pforams@mikrotax - Clavigerinella jarvisi pforams@mikrotax - Clavigerinella jarvisi

Clavigerinella jarvisi

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


Citation: Clavigerinella jarvisi (Cushman 1930)
taxonomic rank: Species
Basionym: Hastigerinella jarvisi
Taxonomic discussion: Blow (1979) did not subdivide Clavigerinella based on chamber length, believing this character to be a function of growth stage and environmental factors, hence he placed C. jarvisi in synonymy with C. eocanica. Our observations of Clavigerinella from a number of sites (ODP Sites 865, 960, 1218, Kane 9-C) indicate that a C. jarvisi morphotype with long finger-like chambers can be distinguished from the moderately clavate form C. eocanica. Complete specimens of this species are extremely rare and it is usually recognised by the detached digitate adult chambers, which are easily recognized by the porous chamber surface and remnants of the apertural arch (Pl.8.2, Figs. 8, 9). We find no evidence for the presence of “roughened projections” representing spine bases as indicated by Cushman’s (1930) original description and find no link to the modern digitate form Hastigerinella digitata. [Coxall & Pearson 2006]

Catalog entries: Hastigerinella jarvisi

Type images:

Distinguishing features:
Parent taxon (Clavigerinella): Final chambers clavate.
This taxon: Final chambers elongate and slender, without terminal swellings

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.


Planispiral or pseudoplanispiral, evolute, biumbilicate or showing a slightly raised spiral side and very shallow umbilicus; 4- 4½ chambers in the final whorl; increasing rapidly in size as added, early chambers rounded, final 2-3 chambers rapidly elongating into slender, cylindrical fingers (digitate); distal chamber ends smooth and rounded or slightly tapered; equatorial high arched aperture, symmetrical or slightly asymmetrical, bordered by a broad imperforate lip; sutures shallow, straight, becoming curved in later stages, short compared to the overall chamber length. [Coxall & Pearson 2006]

Wall type:
Usually smooth, normal perforate, sometimes weakly cancellate; possibly spinose in life. [Coxall & Pearson 2006]

Up to 0.545 mm (Cushman, 1930). Detached chambers can be 0.4 mm, suggesting some specimens are as large as 1 mm. [Coxall & Pearson 2006]

Character matrix
test outline:Stellatechamber arrangement:Pseudoplanispiraledge view:Equally biconvexaperture:Equatorial
sp chamber shape:Elongatecoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Elongateumbilicus:Wideperiph margin shape:N/Aaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Worldwide in low and mid-latitudes. Rare in oligotrophic open ocean sections, occasionally common in upwelling assemblages. Based on the occurrence of common C. jarvisi (recorded as C. eocanica) together with radiolarian-rich sediments in Peru and Ecuador, Stainforth (1948) suggested this species thrived in the cold waters of northward flowing ex-polar currents. His
claim that this species is a strictly cold-water specialist cannot be substantiated, however, since it has never been found in polar regions. More likely, the occurrence of C. jarvisi was linked to western continental margin upwelling. [Coxall & Pearson 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Coxall & Pearson (2006)

Isotope paleobiology
No data available. [Coxall & Pearson 2006]
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light _13C and very heavy _18O. Sources cited by Aze et al. 2011 (appendix S3): Coxall et al. (2000)

Phylogenetic relations
This species probably evolved from C. eocanica in uppermost Zone E7 by extension and tapering of the final chambers. [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: Zone E7-E10. Last occurrence poorly constrained. [Coxall & Pearson 2006]
Last occurrence (top): in mid part of E10 zone (50% up, 42.6Ma, 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. 224


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 O

Cushman, J. A. (1930). Fossil species of Hastigerinella. Contributions from the Cushman Laboratory for Foraminiferal Research. 6(1): 17-19. gs

Nuttall, W. L. F. (1930). Eocene Foraminifera from Mexico. Journal of Paleontology. 4: 271-293. gs

Stainforth, R. M. (1948a). Applied micropalaeotology in coastal Ecuador. Journal of Paleontology. 22: 113-151. gs

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


Clavigerinella jarvisi compiled by the pforams@mikrotax project team viewed: 25-7-2024

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