pforams@mikrotax - truncatulinoides lineage pforams@mikrotax - truncatulinoides lineage

truncatulinoides lineage

Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> truncatulinoides lineage
Sister taxa: hirsuta lineage, menardii lineage, truncatulinoides lineage, tumida lineage, temperate Globorotalia species, G. sp.
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Globorotalia cavernula
Like G. truncatulinoides but smaller, with very wide and open umbilicus, and smooth, finely perforate test.

Globorotalia truncatulinoides
Like G. tosaensis but with a pronounced keel and a more open umbilicus
Globorotalia excelsa

Globorotalia tosaensis
Low trochospiral, strongly umbilico-convex with flat spiral side, commonly 5 chambers in final whorl

Globorotalia tenuitheca
Like G. tosaensis but with sharper curvature and less incision of spiral sutures

crassaformis & variants
Globorotalia hessi
Like G. crassaformis but more subquadrangular in equatorial view and final chamber is more reduced

Globorotalia ronda
Like G. crassaformis but more rounded peripheral margin and relatively thickened test

Globorotalia crassaformis
No keel & flat spiral side

Globorotalia viola
Like G. crassaformis but has keel and more angular chambers

early species
Globorotalia crassaconica
Like G. crassaformis but with broader, steep axial peripheral outline

Globorotalia crassula
Like G. cibaoensis but with more nearly planoconvex test and more strongly angled periphery


Citation: truncatulinoides lineage
taxonomic rank: lineage
Type species: Rotalia truncatulinoides, d'Orbigny
Taxonomic discussion: The subgenus Truncorotalia includes species that in most part consist of conicotruncate forms. This lineage includes both non-keeled and keeled forms and thin-walled and thick-walled forms. The Truncorotalia series is one of the important lineages forming the basis for the late Neogene biostratigraphic subdivisions.
Globorotalia (Truncorotalia) crassula, the earliest member of the lineage, seems to have evolved from Globorotalia (Hirsutella) cibaoensis in cool water (temperate-subantarctic area) and this lineage subsequently diversified during the Pliocene (Text Fig. 16) over a wide range of latitude. We have observed gradation between Gr. cibaoensis and Gr. crassula in DSDP Site 281 (Subantarctic). [Kennett  & Srinivasan 1983]

Catalog entries: Globorotalia (Truncorotalia)

Distinguishing features:
Parent taxon (Globorotalia): Smooth wall; compressed chambers:
This taxon: G. crasula - crassaformis - tosaensis - truncatulinoides lineage, predominantly conicotruncate

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.


Biogeography and Palaeobiology

Most likely ancestor: hirsuta lineage - at confidence level 4 (out of 5). Data source: Kennett & Srinvasan 1983; Stewart 2003; Aze et al. 2011.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within N18 zone (5.20-5.72Ma, base in Messinian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.143


Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Cushman, J. A. & Bermudez, P. J. (1949). Some Cuban species of Globorotalia. Contributions from the Cushman Laboratory for Foraminiferal Research. 25: 26-45. gs O

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Miocene climate change. PhD thesis, Bristol University. 1-269. gs O


truncatulinoides lineage compiled by the pforams@mikrotax project team viewed: 26-5-2024

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