|Daughter taxa (time control age-window is: 0-800Ma)|
Keel & lateral shell outline thickest on last chamber
Like G. tumida, but anterior part of final chamber sharply bent toward the umbilicus.
Large swollen (tumid) test, with exceptionally heavy keel, and rapidly opening spire. Tear-drop lateral shell outline. Larger and more tumid than G. plesiotumida
Like G. merotumida but larger, slightly less convex umbilical side, more ovate equatorial profile, and final chamber is higher than wide.
Low trochospiral, biconvex, equatorial periphery slightly lobate with distinct keel Aperture:a low arch with thick lip. Final chamber is wider than the high.
In general, the early forms (Middle Miocene) in this lineage are non-keeled , while later forms (Late Miocene through Recent) are distinctly keeled. [Kennett & Srinivasan 1983]
Catalog entries: Globorotalia
Parent taxon (Globorotalia): Smooth wall; compressed chambers:
This taxon: G. lenguaensis - merotumida - tumida - flexuosa lineage
Geographic distribution: The subgenus Globorotalia is one of the major globorotaliid lineages in the tropics and provides the basis for the Late Miocene tropical zonation of Blow (1969). [Kennett & Srinivasan 1983]
Most likely ancestor: menardii lineage - at confidence level 3 (out of 5). Data source: Stewart 2003; Aze et al. 2011; NB Kenett & Srinvasan 1983 derived the tumida lineage from the fohsi lineage..
Last occurrence (top): Extant. Data source: Total of range of species in this database
First occurrence (base): in lower part of Tortonian Stage (41% up, 9.8Ma, in Tortonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Primary source for this page: Kennett & Srinivasan 1983, p.151
Bandy, O. L. (1972). Origin and development of Globorotalia (Turborotalia) pachyderma (Ehrenberg). Micropaleontology. 18(3): 294-318. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs
Bandy, O. L. (1972). Origin and development of Globorotalia (Turborotalia) pachyderma (Ehrenberg). Micropaleontology. 18(3): 294-318. gs
Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs
tumida lineage compiled by the pforams@mikrotax project team viewed: 24-5-2022
Short stable page link: https://mikrotax.org/pforams/index.php?id=104245 Go to Archive.is to create a permanent copy of this page - citation notes