Globigerinidae


Classification: pf_cenozoic -> spinose -> Globigerinidae
Sister taxa: Globigerinidae,
Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Distinguished from Globorotaloides by the more compact, radially compressed morphology, with appressed inflated chambers in the final whorl, and the coarse cancellate ruber/sacculifer-type wall texture (as opposed to the sacculifer type wall in Globorotaloides). Most Globorotaloides lack the obligate bulla with a uniform continuous lip or rim bordering the infralaminal aperture(s) which is characteristic of Catapsydrax.
Distinguished from Subbotina and Globoturborotalita by the obligate bulla with infralaminal aperture(s).


Low, trochospiral test with 10-16 chambers, 4-6½ globular chambers in ultimate whorl. Trochospire moderately to highly elevated; aperture interiomarginal, umbilical to slightly extraumbilical, a low, rounded arch bordered by a thin, narrow lip; umbilicus small and open to the apertures of surrounding chambers. Cancellate and spinose wall with spine holes situated along cancellate ridges.

Low trochospirally enrolled, globose test, with 3-5 rapidly inflating, globular chambers in ultimate whorl. Aperture interiomarginal, umbilical, a high arch bordered by a thin rim-like lip or thick imperforate lip. Umbilicus varies from small and restricted to large and open. Wall spinose; spines are supported by spine collars which coalesce to form ridges.

Globigerinathekids are characterized by medium to large-sized subspherical to spherical tests and multiple secondary apertures that are frequently covered by bullae.

Distinguished from other Globigerinacea by Globorotalia-like flattened inner coil of chambers, and the outer coil of globigerine chambers and coarsely cancellate wall texture. Parasubbotina lacks the flattened inner coil of chambers and in general the wall texture is not as coarsely cancellate.

The genus is characterized by taxa with small globular tests, slightly embracing chambers, umbilical aperture with a distinct lip of constant thickness, and a coarse cancellate wall texture.


Guembelitrioides is distinguished from the high-spired Subbotina gortanii group by the presence of supplementary sutural apertures in most specimens. The two are also separated by a gap in their stratigraphic ranges. As described by Blow (1979), in both general morphology and wall ultrastructure Guembelitrioides is closely similar to the modern genus Globigerinoides but is an unrelated homeomorph.



The genus is distinguished by the very low trochospiral test and low-arched umbilical-extraumbilical aperture with a thick lip of constant thickness. There are 4-5 chambers in the ultimate whorl, and a coarsely cancellate, sacculifer-type wall.

Genus distinguished by very low trochospiral test, chambers increasing rapidly in size in ultimate whorl, and high-arched umbilical-extraumbilical aperture. Number of chambers never exceeds 5 in ultimate whorl. Last two chambers may be offset toward umbilicus (P. variospira) giving test the appearance of a higher spire. 

Pseudoglobigerinella n. gen. is identified by its inflated, nearly involute, globular test, asymmetrical equatorial aperture, and the reticulate, Clavigerinella-type wall texture and thickened crust. A tendency towards uncoiling occurs in some morphotypes of the genus.


Low trochospiral, tripartite test with 10-12 chambers, with 3-4 rapidly inflating, globular chambers in ultimate whorl. Aperture interiomarginal, umbilical to slightly extraumbilical in most species, a low arch. Apertural lip varies from narrow to fairly broad with a distinct apparatus extending over umbilicus. Umbilicus small and nearly closed by tight coiling. Wall cancellate and spinose; spines set at juncture of the cancellate ridges with or without spine collars. Cancellate texture varies from weak to very strong and from moderate to very coarse or distinctly honeycombed.

Test very low trochospiral, lobulate, with 4½-7 moderately inflating, globular chambers in ultimate whorl. Ultimate chamber may be directed over and partially cover the umbilicus. Aperture interiomarginal, umbilical to extraumbilical, a wide arch bordered by an imperforate rim or with a narrow thickened lip. In the terminal growth stage an ampullate final chamber with infralaminal apertures may develop. Umbilicus small, often covered by the ultimate chamber. Wall spinose, a ruber-type reticulated wall, short spine collars support spines. A calcite crust often develops in the terminal stage.


Taxonomy

Citation: Globigerinidae Carpenter, Parker, and Jones, 1862
Rank: Family
Taxonomic discussion: A great variety of species and genera with diverse morphologies evolved from the simple trochospiral globigerine forms in the Paleocene. Only the genera Eoglobigerina, Parasubbotina, and Subbotina are represented in the Paleocene. [Olsson et al. 1999]

Catalog entries: Globigerinidae;

Type images:

Short diagnosis: Test lobulate, trochospiral or planispiral, usually with 372-6 globular chambers in final whorl; wall spinose, cancellate, or noncancellate; aperture interiomarginal, umbilical, a low to high arch, with or without a lip, may have supplementary apertures.

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: Test lobulate, trochospiral or planispiral, usually with 372-6 globular chambers in final whorl; wall spinose, cancellate, or noncancellate; aperture interiomarginal, umbilical, a low to high arch, with or without a lip, may have supplementary apertures.

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Burdigalian Stage (100% up, 16Ma, in Burdigalian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 5, p. 69

References:

Olsson, R.K.; Pearson, P.N. & Huber, B.T., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. Allen Press, Lawrence, Kansas, pp. 67-110.

Parker & Jones 1862 [sorry, not in our bibliography yet]


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Globigerinidae compiled by the pforams@mikrotax project team viewed: 13-12-2017

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