|Daughter taxa (time control age-window is: 0-800Ma)|
Specimens which cannot be assigned to established species
Taxonomic discussion: As noted in the discussion of Rugotrnncana, the type species of that genus has two peripheral keels and irregularly arranged costellae, hence Archaeoglobigerina is here restricted to those species without keel. It differs from Rugoglobigerina in lacking meridional alignment of pustules and costellae. Both Fissoarchaeoglobigerina and Kassabella were described as having sutural supplementary apertures on the spiral side, the former said to have tegilla and the latter to have simple apertural lips. However, the presence of true secondary openings appears questionable, and the strongly thickened tegillum reported for Fissoarchaeoglobigerina appears to be the result of secondary calcification rather than a characteristic feature of the foraminifer. The "well-developed lip extending into the umbilicus" of Kassabella is not shown in the original figures, although the umbilicus appears to show remnants of a tegillum. Both are regarded as synonyms of Archaeoglobigerina, pending description of better preserved material.
Original description: Test trochospiral. biconvex to slightly spiroconvex, umbilicate; periphery rounded, but not truncate; with or without imperforate peripheral band or weakly developed double keel. Chambers spherical to ovate, inflated. Suture depressed on both spiral and umbilical sides. straight to curved. Wall perfectly smooth to somewhat rugose; rugosities not aligned in meridionial pattern. Primary aperture umbilical, interiomarginal, covered by tegilla with intralaminal and infralaminal accessory apertures in perfectly preserved specimens. Outer wall radial hyaline perforate except for keels which are both radial hyaline imperforate and partly ultragranular hyaline, imperforate and the rugosities which are ultragranular hyaline, imperforate. Septal walls and tegilla microgranular hyaline. finely perforate.
Entries in the Catalog of original descriptions: Archaeoglobigerina
Parent taxon (Rugoglobigerinidae): Test trochospiral, chambers inflated, periphery rounded, not carinate; wall with pustules, costellae, or other rugosities; aperture umbilical, with portici or tegilla.
This taxon: Test a low to flat trochospire, chambers globular and enlarging rapidly, four to six in the final whorl, sutures radial and depressed, umbilicus wide, occupying one-fourth to one-third of the diameter, periphery rounded, without keel or imperforate carinal band, peripheral outline lobate; wall calcareous, perforate, surface rugose, with irregularly arranged pustules and costellae, never meridionally aligned; primary aperture interiomarginal, umbilical, with tegilla filling the umbilicus and provided with both proximal and distal accessory apertures.
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Total of range of species in this database
Plot of range and occurrence data:
Loeblich, A. R. & Tappan, H. (1961). Cretaceous planktonic foraminifera: Part I-Cenomanian. Micropaleontology. 7: 257-304. gs Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs
Loeblich, A. R. & Tappan, H. (1961). Cretaceous planktonic foraminifera: Part I-Cenomanian. Micropaleontology. 7: 257-304. gs
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs
Archaeoglobigerina compiled by the pforams@mikrotax project team viewed: 28-10-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=110010 Go to Archive.is to create a permanent copy of this page - citation notes