pforams@mikrotax - Cribrohantkenina

pforams@mikrotax - Cribrohantkenina pforams@mikrotax - Cribrohantkenina

Cribrohantkenina

Classification: pf_cenozoic -> Hantkeninidae -> Cribrohantkenina
Sister taxa: Cribrohantkenina, Hantkenina, Clavigerinella

Daughter taxa (time control age-window is: 0-800Ma)
			Cribrohantkenina inflata Hantkeninids with one of more areal apertures in addition to the primary aperture in the final adult chamber(s). Often very large (tests can be >1.0 mm).
			Cribrohantkenina sp. Specimens which cannot be assigned to established species

Taxonomy

Citation: Cribrohantkenina Thalmann, 1942

taxonomic rank: Genus

Type species: Hantkenina (Cribrohantkenina) bermudezi Thalmann (by original designation; regarded by Thalmann [1942] as a junior synonym of Hantkenina inflata Howe, 1928).

Synonyms:

Hantkenina (Cribrohantkenina), Thalmann, 1942:812. Type species Hantkenina (Cribrohantkenina) bermudezi Thalmann.
Cribrohantkenina Thalmann.—Spraul, 1963:367. Type species, Hantkenina (Cribrohantkenina) bermudezi Thalmann.

Taxonomic discussion: The somewhat complicated taxonomic history of this genus was discussed by Blow (1969, 1979). As argued by Barnard (1954), the presence of additional areal apertures in Cribrohantkenina alone may not warrant distinction at the generic level. However, the genus is retained here to preserve taxonomic stability because it is stratigraphically useful and universally recognized. Following Blow (1979) and Toumarkine and Luterbacher (1985), Cribrohantkenina is regarded as a monotypic genus. [Coxall & Pearson 2006]

Catalog entries: Cribrohantkenina, Hantkenina (Cribrohantkenina)

Distinguishing features:
Parent taxon (Hantkeninidae): Planispiral, wall smooth
This taxon: Final chambers with tubulospines and areal apertures

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

Morphology:

Planispiral, biumbilicate, 5-6 chambers in the final whorl, increasing rapidly in size as added; chambers polygonal or spherical and highly inflated, adult chambers extended into a hollow tubulospine, spanning the suture between chambers; multiple ‘cribrate’ aperture system.
[Coxall & Pearson 2006]

Wall type:

Smooth, normal perforate, probably non-spinose. [Coxall & Pearson 2006]

Biogeography and Palaeobiology

Most likely ancestor: Hantkenina - at confidence level 4 (out of 5). Data source: Coxall & Pearson 2006.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of E16 zone (100% up, 33.9Ma, in Priabonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within E14 zone (35.89-37.99Ma, base in Bartonian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Hantkeninidae

Primary source for this page: Coxall & Pearson 2006 - Eocene Atlas, chap. 8, p. 225

References:

Barnard, T. (1954). Hantkenina alabamensis Cushman and some related forms. Geological Magazine. 91(5): 384-390. gs

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

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

Howe, H. V. (1928). An observation on the range of the genus Hantkenina. Journal of Paleontology. 2(1): 13-14. gs

Spraul, G. L. (1963). Current status of the upper Eocene foraminiferal guide fossil, Cribrohantkenina. Journal of Paleontology. 37(2): 366-370. gs

Thalmann, H. E. (1942). Foraminiferal genus Hantkenina and its subgenera. American Journal of Science. 240: 809-820. gs

Cribrohantkenina compiled by the pforams@mikrotax project team viewed: 12-10-2024

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=100072 Go to Archive.is to create a permanent copy of this page - citation notes

Add Comment

Comments

No comments yet. Be the first!