Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
final chambers (sub)triangular | ||||
![]() | ![]() | Hantkenina nanggulanensis Final 1-2 chambers globular, test large (up to 0.47 mm) | ||
Hantkenina alabamensis Final 1-2 chambers laterally inflated, coiling compact and involute, tubulospines forward leaning. | ||||
![]() | ![]() | Hantkenina primitiva Like H. compressa but tubulospines absent on early adult chambers and test generally smaller. | ||
![]() | ![]() | Hantkenina compressa Final chambers triangular, with nearly continuous peripheral outline; tubulospines in the trans-sutural position and with forward-inclined orientation. | ||
![]() | ![]() | ![]() | Hantkenina australis Species showing features of H. dumblei and H. compressa, but unique in having posteriorly recurved tubulospines. | |
![]() | ![]() | ![]() | Hantkenina dumblei Final chambers triangular, with nearly continuous peripheral outline, tubulospines in anterior (near sutural) position. | |
final chambers elongate | ||||
![]() | ![]() | ![]() | Hantkenina lehneri Final chambers elongate with tubulospines in forward position; peripheral outline distinctly stellate. 5-6 chambers in the final whorl. | |
![]() | ![]() | ![]() | Hantkenina liebusi Like H. mexicana but with more compressed test, less stellate peripheral outline, and tubulospines in a more forward position. 4½-6 chambers in the final whorl. | |
![]() | ![]() | ![]() | Hantkenina mexicana Final chambers elongate; tubulospines centrally positioned; peripheral outline distinctly stellate. 4-5 chambers in the final whorl. | |
![]() | ![]() | ![]() | Hantkenina singanoae Final chambers very elongate with rudimentary terminal cylindrical extensions, but lacking true tubulospines. 4-5 chambers in the final whorl. | |
Hantkenina sp. Specimens which cannot be assigned to established species |
[Coxall & Pearson 2006]
Catalog entries: Hantkenina
Distinguishing features:
Parent taxon (Hantkeninidae): Planispiral, wall smooth
This taxon: Final chambers with tubulospines
Emended description:
Morphology:
[Coxall & Pearson 2006]
Wall type:
Size:
Isotope paleobiology: Coxall et al. 2000 inferred from stable isotopes that "the hantkeninids originated in a deep-water oxygen-minimum environment, but migrated into fully oxygenated near-surface waters as global temperatures decreased and water-column stratification declined. This change in depth ecology coincided with pronounced morphological evolution, involving changes in chamber shape and degree of inflation, and modification of the primary aperture. These developments are considered to be adaptations to a near-surface habitat"
Phylogenetic relations: Hantkenina evolved gradually from Clavigerinella caucasica in the latest early Eocene (Coxall and others, 2003). It gave rise to Cribrohantkenina in the late Eocene and the entire family went extinct at the Eocene/Oligocene boundary (33.7 Ma). [Coxall & Pearson 2006]
Most likely ancestor: Clavigerinella - at confidence level 4 (out of 5). Data source: Coxall & Pearson 2006; .
Likely descendants: Cribrohantkenina;
plot with descendants
Geological Range:
Last occurrence (top): at top of Priabonian Stage (100% up, 33.9Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Lutetian Stage (57% up, 44Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Primary source for this page: Coxall & Pearson 2006 - Eocene Atlas, chap. 8, p. 229
Bermudez, P. J. (1937b). Nuevas especies de Foraminiferos del Eoceno de Cuba. Memorias de la Sociedad Cubana de Historia Natural. 11: 137-150. gs V O 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 Brönnimann, P. (1950b). The Genus Hantkenina Cushman in Trinidad and Barbados, B. W. I. Journal of Paleontology. 24(4): 397-420. 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., Pearson, P. N., Shackleton, N. J. & Hall, M. A. (2000). Hantkeninid depth adaptation: An evolving life strategy in a changing ocean. Geology. 28: 87-90. gs Coxall, H. K., Huber, B. T. & Pearson, P. N. (2003). Origin and morphology of the Eocene planktonic foraminifera Hantkenina. Journal of Foraminiferal Research. 33: 237-261. gs Cushman, J. A. (1924a). A new genus of Eocene foraminifera. Proceedings of the United States National Museum. 66(30): 1-4. gs Thalmann, H. E. (1942). Foraminiferal genus Hantkenina and its subgenera. American Journal of Science. 240: 809-820. gs V OReferences:
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Hantkenina compiled by the pforams@mikrotax project team viewed: 7-7-2022
Short stable page link: https://mikrotax.org/pforams/index.php?id=100154 Go to Archive.is to create a permanent copy of this page - citation notes |