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Archaeoglobigerina bosquensis


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

Taxonomy

Citation: Archaeoglobigerina bosquensis Pessagno 1967
Rank: Species
Basionym: Archaeoglobigerina bosquensis
Taxonomic discussion: Archaeoglobigerina bosquensis Pessagno differs from A. blowi Pessagno (1) by being equally dextrally and sinistrally coiled; (2) by having a relatively high trochoidal spire; (3) by having a somewhat smaller, deeper umbilicus; (4) by usually having six or seven as opposed to four or five chambers in the last whorl; (5) by having chambers which gradually increase in size; and (6) by lacking keels and imperforate peripheral bands. A. bosquensis derives its name from that of the South Bosque River. [copied from Chronos database]
Similar species: -Differs from Archaeoglobigerina australis Huber by having a less coarsely pustulose test surface and absence of thick portici protruding into the umbilicus.
-Differs from species of Rugoglobigerina by the absence of meridional costellae.
-See remarks for differences from A. blowi. [copied from Chronos database]

Type images:

Original description: Archaeoglobigerina bosquensis Pessagno 1967: "Test coiled in relatively high trochospiral coil; 6-7 chambers in last whorl. Coiling sinistral or dextral with no preferences insofar as known. Chambers spherical in shape about as wide as long; tending to shift toward the umbilicus with coiling. Sutures curved, radial, depressed both spirally and umbilically. Umbilicus deep and of moderate to small size. Early chambers of last whorl somewhat rugose. Keels, imperforate peripheral bands lacking in specimens thus far encountered. Primary aperture interiomarginal, umbilical in position; no evidence of tegilla due to unfavorable conditions of preservation in Austin chalk. Outer wall radial hyaline perforate; septal walls microgranular hyaline, finely perforate."

Entries in the Catalog of original descriptions: Archaeoglobigerina bosquensis;

Geological Range:
Last occurrence (top): within G. elevata zone (79.20-84.19Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (86.71-89.91Ma, base in Turonian 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:Circularcoiling axis:Low-moderatechamber arrangement:Trochospiralumbilicus:Wide
edge view:umbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:
wall texture:Moderately muricateaperture:Umb.-extraumbilicalaperture border:Thin porticusaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Globularperiph margin shape:Moderately rounded
umb depth:Shallowdiameter mm:0.39width mm:breadth mm:0.19
final-whorl chambers:5.0-6.0

References:

Pessagno, E.A., Jr., (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontograph. Americana, 5: 245-445.


Archaeoglobigerina bosquensis compiled by the pforams@mikrotax project team viewed: 29-5-2017

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