pforams@mikrotax - Archaeoglobigerina bosquensis

Archaeoglobigerina bosquensis


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

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]

Type images:

Original description: "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 range and occurrence data:

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:aperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin porticus
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Moderately muricateshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

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


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Archaeoglobigerina bosquensis compiled by the pforams@mikrotax project team viewed: 20-9-2021

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110013 Go to Archive.is to create a permanent copy of this page - citation notes



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