Classification: pf_cenozoic -> microperforate -> Problematica
Sister taxa: Cassigerinellidae, Chiloguembelinidae, Guembelitriidae, Heterohelicidae, Problematica,
Daughter taxa: (blue => in age window 0-300Ma) Granddaughter taxa
Differs from normal perforate planktonic foraminifera by having a monolamellar wall surface covered with randomly scattered short, blunt to hispid pustules; differs from Tenuitella by the greater range of pore sizes and tendency to have a hispid wall texture; differs from Praepararotalia Liu and others (1998) by the more even distribution of pustules on both sides of the test rather than restriction of pustules to the umbilical side, absence of fused or linearly aligned pustules, and by having a rounded rather than subrounded to subcarinate peripheral margin; differs from Acarinina by presence of a monolamellar wall and less dense and less coarsely pustulose surface ornamentation.

Specimens which cannot be assigned to established species


Citation: Problematica
Rank: Genus

Catalog entries:

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in lower part of Rupelian Stage (31% up, 32.1Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Lutetian Stage (60% up, 43.8Ma, in Lutetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 12, p. 397


Berggren, W.A.; Olsson, R.K. & Premoli Silva, I., (2006). Taxonomy, biostratigraphy and phylogenetic affinities of Eocene Astrorotalia, Igorina, Planorotalites, and Problematica (Praemurica? lozanoi). In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. 41. Cushman Foundation Special Publication Allen Press, Lawrence, Kansas, pp. 377-400.


Problematica compiled by the pforams@mikrotax project team viewed: 14-8-2018

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