|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Test with early whorls in a flat trochospiral coil, later whorls planispiral and biumbilicate, involute to partially evolute, sutures radial, depressed, peripheral outline lobulate, peripheral margin rounded and noncarinate; wall calcareous, moderately coarsely perforate; aperture a low and commonly asymmetrical, interiomarginal, umbilical-equatorial arch, parts of successive apertures may remain as relict supplementary apertures on one side of the test, the other side with accessory apertures opening into the posterior part of the chamber and bordered by a lip that is a continuation from that of the primary aperture.
Test trochospiral, biconvex to planoconvex, umbilicate, chambers angular to rhomboid in edge view, sutures elevated, curved, oblique on the spiral side, depressed to flush, straight to curved and radial on the umbilical side, periphery angular with a single keel, peripheral outline entire to lobulate; wall calcareous, finely and densely perforate, optically radial, surface smooth to pustulose, sutures may be thickened to beaded; aperture interiomarginal, extraumbilical-umbilical, bordered by a narrow to wide imperforate lip, accessory apertures along the sutural margin formed by an umbilical flaplike extension from the chamber and bordered by a narrow imperforate lip.
Test trochospiral, biconvex to planoconvex, umbilicate, chambers globular to ovate, sutures curved on the spiral side, radial on the umbilical side, depressed, periphery rounded and without a keel or poreless margin, peripheral outline lobulate; wall calcareous, optically radial, surface smooth, finely perforate, secondary lamellae emphasizing the surface rugosity and obscuring some pores but enlarging others.
Entries in the Catalog of original descriptions: Rotaliporinae
Distinguishing features: Test trochospirally enrolled, primary aperture umbilical-extraumbilical in position and with bordering lip, secondary sutural apertures on umbilical side open into posterior edge of chambers.
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian 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
Rotaliporidae compiled by the pforams@mikrotax project team viewed: 25-7-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=110498 Go to Archive.is to create a permanent copy of this page - citation notes