Daughter taxa: (blue => in age window 0-800Ma) | Granddaughter taxa | |||
Cribrohantkenina Final chambers with tubulospines and areal apertures | ||||
Hantkenina Final chambers with tubulospines | H. nanggulanensis H. alabamensis H. primitiva H. compressa H. australis H. dumblei H. lehneri H. liebusi H. mexicana H. singanoae H. sp. | |||
![]() | ![]() | ![]() | Clavigerinella Final chambers clavate. |
Catalog entries: Hantkeninidae
Distinguishing features: Planispiral, wall smooth
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.
Wall type: Normal perforate, Clavigerinella-type wall, smooth or weakly cancellate; some species possibly sparsely spinose. [Coxall & Pearson 2006]
Morphology: Planispiral or ‘pseudo-planispiral’ coiling; early chambers rounded, becoming digitate/clavate, triangular, polygonal, or spherical in the adult stages, laterally compressed or highly inflated; primary aperture a single narrow, symmetrical equatorial arch, bordered by an imperforate lip, accompanied or replaced by one or more additional areal apertures in the final 1-3 chambers (Cribrohantkenina); adult chambers of Hantkenina and Cribrohantkenina extend into a pronounced terminal nub or well-developed hollow tubulospine, projecting radially or at a low angle with respect to the chamber periphery in the direction of coiling. [Coxall & Pearson 2006]
Most likely ancestor: Globigerinidae - at confidence level 3 (out of 5). Data source: The ancestor of Clavigerinella is now thought to be Subbotina.
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): near top of Ypresian Stage (85% up, 49.1Ma, in Ypresian 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. 214
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 Cushman, J. A. (1927e). Some characteristic Mexican fossil foraminifera. Journal of Paleontology. 1(2): 147-172. gsReferences:
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Hantkeninidae compiled by the pforams@mikrotax project team viewed: 18-1-2021
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