Astrorotalia


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Astrorotalia
Sister taxa: Acarinina, Astrorotalia, Igorina, Morozovella, Morozovelloides, Planorotalites, Praemurica,
Daughter taxa (blue => in age window 0-300Ma)
This form is uniquely distinguished by the peripheral keel extending into blade-like keel-spines on each chamber.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Astrorotalia Turnovsky, 1958
Rank: Genus
Type species: Globorotalia palmerae Cushman and Bermúdez, 1937

Catalog entries: Astrorotalia;

Type images:

Short diagnosis: Low trochospiral test with tapering keelspines on each chamber,

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.

Description


Diagnostic characters: This monospecific genus is easily recognized by the peripheral keel that extends into blade-like projections (which we call ‘keel-spines’ as distinct from the hollow tubulospines of Hantkenina) at the midpoint of each chamber in the ultimate whorl. In contrast to similar morphologic taxa such as the benthic foraminifer Pararotalia, the genus has a normal perforate wall with short coalescing pustulose ridges surrounding the pores, thus producing a roughened or cancellate-like appearance in the adult and terminal stages. [Berggren et al. 2006]

Biogeography and Palaeobiology

Most likely ancestor: Planorotalites - at confidence level 0 (out of 5). Data source: Berggren et al. 2006.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in lower part of Lutetian Stage (32% up, 45.7Ma, in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (71% up, 50.2Ma, in Ypresian 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. 379

References:

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. Allen Press, Lawrence, Kansas, pp. 377-400.

Bermudez, P.J., (1937). Nuevas especies de Foraminiferos del Eoceno de las cercanias de Guanajay, provincia Pinar del Rio, Cuba. Memorias de la Sociedad Cubana de Historia Natural, 11(4): 237-248.

Turnovsky, K., (1958). Eine neue Art von Globorotalia Cushman aus dem Eozaen Anatoliens und ihre Zuordnung su einer neuen Untergattung. Bulletin of the Geological Society of Turkey, 6(2): 80-86.


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Astrorotalia compiled by the pforams@mikrotax project team viewed: 16-12-2017

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