|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Test planispirally enrolled and involute, biumbilicate, early chambers globular and inflated, later ones radially elongate, and final one or two chambers clavate, sutures distinct, depressed; wall calcareous, moderately coarsely perforate, radial, surface pitted; aperture equatorial, an interiomarginal arch bordered with a distinct lip, lateral extremities of the aperture commonly remaining open as relict supplementary apertures around the umbilicus as new chambers are added.
Test planispirally enrolled, biumbilicate, involute to evolute, lobulate in outline, chambers globular to somewhat elongate in partially evolute species, sutures depressed; wall calcareous, perforate, optically radial; aperture equatorial and interiomarginal, bordered by a narrow imperforate lip, broad and low to moderately arched, the lateral portions remaining open as relict supplementary apertures around the umbilicus when new chambers are added.
Test planispirally enrolled and involute, biumbilicate, early chambers globular and inflated, later ones radially elongate, and those of the final whorl long and tapering, resembling tubulospines; wall calcareous, finely perforate; aperture a low interiomarginal equatorial arch bordered by a distinct lip, lateral part of the aperture remaining open as relict supplementary apertures around the umbilicus on each side as new chambers are added.
Planispiral, wall texture smooth except sometimes pustulose early chambers, weakly lobate with 6-9 chambers in final whorl.
Test planispiral throughout, biumbilicate, peripheral margin rounded to acute; wall micro-finely perforate and muricate throughout; coiling involute to evolute, chambers globular to axially compressed; may be uniapertural or biapertural with bordering lip. Differs from Laeviella by having a muricate rather than smooth test surface; differs from Polycamerella by lacking any infolding of the test wall along the sutural margin of biapertural portici.
Differs from all species of Planohedbergella and Laeviella by having: (1) consistent presence of a biapertural final chamber bearing broad, low apertural slits that open along the outer margin of the umbilicus and are bordered by infolding tubular apertural flaps that usually project directly into the umbilicus, (2) a more weakly lobate peripheral outline, (3) the slowest, continuously log-linear chamber expansion rate (text-figs. 4a, 4e, 6), and (4) the greatest total number of chambers in the adult test (average = 23).
Entries in the Catalog of original descriptions: Globigerinelloididae
Parent taxon (pf_mesozoic):
This taxon: Test planispiral, chambers globular to radially elongate; aperture at the base of the chamber face and equatorial in position, lateral portions of primary aperture may remain open as new chambers are added, forming relict openings around the umbilical region.
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Valanginian Stage (0% up, 139.4Ma, in Berriasian stage). Data source: Total of range of species in this database
Plot of range and occurrence data:
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs
Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs
Globigerinelloididae compiled by the pforams@mikrotax project team viewed: 29-5-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=110151 Go to Archive.is to create a permanent copy of this page - citation notes
Hello! Is it possible that the Globigernelloides plot of range is wrong? Last occurrence is at aptian/albian boundary, not at Maastrichtian.
(Excuse my horrible english)
Thank you for pointing that out. The generic ranges are based on the total range of species but they had not been updated to take account of recent changes in taxonomy, I have done that now.
Thank you and congratulations on your great work!!