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 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 |
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
Most likely ancestor: hirsuta lineage - at confidence level 4 (out of 5). Data source: Kennett & Srinvasan 1983; Stewart 2003; Aze et al. 2011.
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 OReferences:
truncatulinoides lineage compiled by the pforams@mikrotax project team viewed: 8-12-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=104244 Go to Archive.is to create a permanent copy of this page - citation notes |