Guembelitriidae


Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae
Sister taxa: Cassigerinellidae, Chiloguembelinidae, Guembelitriidae, Heterohelicidae,
Daughter taxa: (blue => in age window 0-300Ma) Granddaughter taxa


Test tiny, low to high trochospire of 2-2½ whorls; each whorl with 3-4 inflated, subglobular chambers. Aperture umbilical, a very small, low arch. Sometimes small supplementary apertures on spiral side.

Test small and triserial. Aperture bordered by a distinct lip and often slightly asymmetric. Wall structure microperforate; surface texture of well-preserved specimens characterized by presence of pore-mounds.



Original description inaccurate, especially with respect to surface texture. Test typically small, with moderate to flat trochospire consisting of 2½ whorls of globular or subglobular chambers. Chambers gradually increase in size; Vli-1 chambers in each whorl, separated by radial and depressed sutures on both spiral and umbilical sides. Umbilicus closed. Aperture umbilical to extraumbilical, ranging from comma-shaped arch to long narrow opening extending up apertural face in nearly equatorial position. Aperture bordered by a slight lip. Surface texture microperforate, pustulous or smooth; when pustulous, well-preserved parvularugoglobigerinids exhibit pore-mound surface texture characteristic of guembelitriid taxa. Pores do not end in pits; pustules not aligned.

Tests contain an initial whorl of 3 chambers, later whorls of 2 chambers each. Test wall microperforate, marked by a guembelitriid surface texture (smooth walled or bearing perforate pustules). Aperture usually asymmetrically positioned and thin apertural lip infolded on one side.

Taxonomy

Rank: Family
Type species: Type genus: Guembelitria Cushman, 1933.<
Synonyms:
Taxonomic discussion:

Montanaro Gallitelli (1957) emended the Family Heterohelicidae, and created the Subfamily Guembelitriinae, which was comprised of the two triserial genera Guembelitria and Guembelitriella. The Genus Woodringina, which is restricted to the lower Paleocene, is characterized by triserial coiling in the early chambers and biserial in later chambers; Loeblich and Tappan (1956) placed it in the Guembelitriinae. El-Naggar (1971) raised the Guembelitriidae to family status. Haynes (1981) distinguished Jenkinsina from Guembelitria based on the absence of pore mounds, which was supported and documented by SEM images of both genera by Jenkins and others (1998). d’Hondt and others (in Olsson and others, 1999) included in the Family Guembelitriidae four early Paleocene genera, including Guembelitria, Globoconusa, Parvularugoglobigerina and Woodringina, on the basis of their phylogenetic relationship, wall texture and morphological characteristics. Huber and others (2006) included in the Family Guembelitriidae the Eocene genera Jenkinsina and Cassigerinelloita. In this work we also include Jenkinsina within the Guembelitriidae due to the triserial chamber arrangement and the smooth to weakly pustulose wall texture. Rare specimens of Jenkinsina columbiana with perforated pustules on the test surface suggest a phylogenetic link between Guembelitria and Jenkinsina. This is confirmed in this work by new findings of numerous specimens of Jenkinsina columbiana in the upper lower Paleocene (planktonic foraminiferal Zones P2 and P3a) in the Palmyride region of Syria. [Premec Fucek et al. 2018]

In the Early Danian Arenillas and coworkrs (e.g Arenillas et al. 2018, Arenillas & Arz 2017) have proposed a significantly revised taxonomy, this is not reflected here yet. [editor's comment - JRY 2018]

 

Catalog entries: Guembelitriidae [not in catalog yet]Guembelitriinae;

Type images:

Distinguishing features: Tests triserial, trochospiral, or nearly triserial in initial whorl becoming biserial. Chambers usually globular or subglobular, increasing gradually in size. Aperture usually a loop-shaped arch, often slightly infolded on one side, marked by a fine lip.

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.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters: Original description of foraminiferal tests assignable to subfamily Guembelitriinae does not apply to all members of family Guembelitriidae. Tests of guembelitriid foraminifera either triserial (Guembelitria spp.), trochospiral (Parvularugoglobigerina spp., Globoconusa spp.), or nearly triserial in initial whorl and approximately biserial in later whorls (Woodringina spp.). Chambers usually globular or subglobular, increasing gradually in size. Aperture usually a loop-shaped arch, often slightly infolded on one side, marked by a fine lip. Surface texture microperforate, smooth to pustulous; when present, pustules or small mounds generally perforated by one or more pores ("pore-mounds") (Guembelitria, Parvularugoglobigerina, Woodringina) or peripherally associated with pores (Globoconusa). [D'Hondt et al. in Olsson et al. 1999]

Biogeography and Palaeobiology


Phylogenetic relations: Molecular analyses of the Recent triserial species Gallitellia vivans indicate it belongs in a separate lineage of planktonic foraminifera that branches close to the benthic rotaliids (Ujiié and others, 2008). Those authors also conclude that multiple transitions from a benthic to planktonic mode of life may have occurred within this taxonomic group. [Premec Fucek et al. 2018]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in upper part of Aquitanian Stage (74% up, 21.1Ma, in Aquitanian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Maastrichtian Stage (36% up, 69.9Ma, in Maastrichtian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p.77

References:

Arenillas, I. & Arz, J.A., (2017). Benthic origin and earliest evolution of the first planktonic foraminifera after the Cretaceous/Palaeogene boundary mass extinction. Historical Biology, 29: 25-42.

Arenillas, I.; Arz, J.A. & Gilabert, V., (2018). Blooms of aberrant planktic foraminifera across the K/Pg boundary in the Western Tethys: causes and evolutionary implications

Blow, W.H., (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea), 2. E. J. Brill, Leiden, 1413 pp.

El-Naggar, Z.R., (1971). On the classification, evolution and stratigraphical distribution of the Globigerinacea. In: Farinacci, A. (Editor), Proceedings of the II Planktonic Conference, Roma 1970. Edizioni Tecnoscienza, Rome, pp. 421-476.

Haynes, J.R., (1981). Foraminifera. John Wiley and Sons, New York.

Jenkins, D.G.; Whittaker, J.E. & Curry, D., (1998). Palaeogene triserial planktonic foraminifera. Journal of Micropalaeontology, 17: 61-70.

Loeblich, A.R. & Tappan, H., (1956). Chiloguembelina, a new Tertiary genus of the Heterohelicidae (Foraminifera). Journal of the Washington Academy of Sciences, 46: 340.

Olsson, R.K.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology, 85. Smithsonian Institution Press, Washington, DC, 1-252 pp.

Premec Fucek, V.; Hernitz Kucenjak, M. & Huber, B.T., (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Chiloguembelina and Jenkinsina. In: Wade, B.S. et al. (Editors), Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research Special Pulbication. 46, pp. 459-481.


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Guembelitriidae compiled by the pforams@mikrotax project team viewed: 16-11-2018

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