Daughter taxa (time control age-window is: 0-800Ma) | ||||
Globorotalia ungulata Keel & lateral shell outline thickest on last chamber | ||||
Globorotalia flexuosa Like G. tumida, but anterior part of final chamber sharply bent toward the umbilicus. | ||||
Globorotalia tumida Large swollen (tumid) test, with exceptionally heavy keel, and rapidly opening spire. Tear-drop lateral shell outline. Larger and more tumid than G. plesiotumida | ||||
Globorotalia plesiotumida Like G. merotumida but larger, slightly less convex umbilical side, more ovate equatorial profile, and final chamber is higher than wide. | ||||
Globorotalia merotumida 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
Distinguishing features:
Parent taxon (Globorotalia): Smooth wall; compressed chambers:
This taxon: G. lenguaensis - merotumida - tumida - flexuosa lineage
Geographic distribution
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..
Geological Range:
Last occurrence (top): at top of Pt1b subzone (100% up, 0Ma, in "Holocene" stage). Data source: Total of ranges of the species in this database
First occurrence (base): within N16 zone (8.58-9.83Ma, base in Tortonian stage). Data source: Total of ranges 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 Cushman, J. A. (1927a). An outline of a re-classification of the Foraminifera. Contributions from the Cushman Laboratory for Foraminiferal Research. 3: 1-105. gs O Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gsReferences:
tumida lineage compiled by the pforams@mikrotax project team viewed: 15-12-2024
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 |