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Archaeoglobigerina mateola


Classification: pf_mesozoic -> Rugoglobigerinidae -> Archaeoglobigerina -> Archaeoglobigerina mateola
Sister taxa: A. australis, A. blowi, A. bosquensis, A. cretacea, A. mateola,

Taxonomy

Citation: Archaeoglobigerina mateola Huber 1990
Rank: Species
Basionym: Archaeoglobigerina mateola
Taxonomic discussion: This species has a very unusual external morphology compared with other known Late Cretaceous planktonic foraminifer taxa. Similarity in the ontogenetic development of this species suggests a close ancestral relationship with A. australis (Huber, 1988). Inclusion in Archaeoglobigerina is primarily because of the globigerine chamber arrangement and absence of meridional costellae. Neither tegilla nor peripheral keel bands were observed in the Maud Rise populations, however, so similarity to the original definition of Archaeoglobigerina (see Pessagno, 1967, p. 315) is limited. [copied from Chronos database]

Type images:

Original description: Archaeoglobigerina mateola Huber 1990: Test coiled in a moderate to high spire, equally to unequally biconvex, spiral side often more convex than umbilical side, average diameter of adult specimens 0.28 mm, average breadth 0.19 mm. Chambers globular, inflated, increasing moderately in size, three and three-quarters to four and one-half in the final adult whorl, four to four and one-half in the penultimate whorl, 10-12 comprising the tests of adult specimens, final chambers usually kummerform. Proloculus diameter averaging 0.017 mm, initial whorl diameter averaging o.07 mm, with a mean of 4.5 chambers in the initial whorl. Sutures radial and straight, strongly depressed on umbilical side, moderately depressed on spiral side. Aperture umbilical in position on adult specimens, usually obscured by a broad flap or thickened umbilical bulla. Apertures of juvenile specimens umbilical to extra-umbilical, having greater width than height. Surface distinctly ornamented with randomly situated, large pustules or high, narrow spines on adult specimens, smooth to finely pustulose on juveniles. Outer wall radial hyaline and finely perforate.

Entries in the Catalog of original descriptions: Archaeoglobigerina mateola;

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74.00-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Lobatecoiling axis:Moderate-highchamber arrangement:Trochospiralumbilicus:Narrow
edge view:inequally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Macroperforate: >2.5
wall texture:Coarsely pustuloseaperture:Umb.-extraumbilicalaperture border:Thin porticusaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Moderately rounded
umb depth:Deepdiameter mm:0.28 mmwidth mm:n/abreadth mm:0.19 mm
final-whorl chambers:4.0-5.0

References:

Huber 1990 [sorry, not in our bibliography yet]


Archaeoglobigerina mateola compiled by the pforams@mikrotax project team viewed: 30-5-2017

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