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.
Globorotalia (Globorotalia) - e.g. Bandy 1972, Kennett & Srinivasan 1983
Taxonomic discussion: The concept of this subgenus employed here is essentially the same as that proposed by Bandy (1972). The phylogeny of this subgenus is Gr. (Gr.) lenguaensis to paralenguaensis to merotumida to plesiotumida to tumida tumida to tumida flexuosa. The evolutionary development of this bioseries has been described by Blow (1969). Globorotalia ungulata is also included in this subgenus, because of its close morphological similarity with Gr. (Gr.) tumida tumida (Text Fig. 17). Although forms included in the subgenus Globorotalia have many features in common with Menardella, the two groups are phylogenetically distinct. 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]
Distinguishing features: Parent taxon (Globorotalia): Smooth wall; compressed chambers: This taxon: G. lenguaensis - merotumida - tumida - flexuosa lineage
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
Biogeography and Palaeobiology
Geographic distributionThe 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..
Biostratigraphic distribution
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:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Globorotalia
Primary source for this page: Kennett & Srinivasan 1983, p.151
References:
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. gsO
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 teamviewed: 5-10-2024
/Globorotalia (Globorotalia) merotumida/Blow 1969 pl09 f04-6.JPG)
/Globorotalia (Globorotalia) merotumida/merotumida(G)_P45684_Holo.JPG)
