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Archaeoglobigerina cretacea


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

Taxonomy

Citation: Archaeoglobigerina cretacea (d'Orbigny, 1840)
Taxonomic rank: species
Basionym: Globigerina cretacea
Synonyms:

Type images:

Original description:

G. testa suborbiculari, compressa, rugoso-aculeata, spira obtusa, anfracribus tribus distinctis; loculis quinis, depresso-spheroidalibus, suturis excavatis; apertura magna in umbilico.

"Coquille suborbiculaire, comprimee, rugueuse, et meme couverte de petites pointes inegales. Spire a peine convexe, tres obtuse, composee de trois tours tres distincts, et formee, dans l'etat adulte, de quatorze a quinze loges. Loges spheriques, un peu deprimees, au nombre de cinq au dernier tour, fortement separees, et laissant a leur centre un ombilic large et profound. Ouverture tres grande en croissant, placee dans l'ombilic meme. On remarque une seconde ouverture, peut-etre accidentelle, a la troisieme loge. 

Type Description (translated from French): Dimensions: diameter, a quarter of a millimeter. Shell subcircular, compressed, rugose, even covered with small conical protuberances of unequal size. Spire barely convex, very obtuse, comprising three very distinct whorls and, in the adult stage, fourteen to fifteen chambers. Chambers spherical, slightly depressed, numbering five in the last whorl, strongly separated, providing room for a broad and deep umbilicus in their center. Aperture, large in size, crescent-shaped located in the umbilicus itself. In the third chamber, one notices a second aperture, perhaps accidental.

Description of lectotype: The test is a low trochospire consisting of about 2½ whorls of inflated chambers. The dorsal surface is flattened and only slightly convex. The axial periphery is rounded and only very slightly if at all truncated. The equatorial profile is subcircular and the equatorial periphery is lobulate. The last whorl consists of five slowly and regularly enlarging, little embracing but inflated chambers, which are slightly compressed dorso-ventrally. The dorsal sutures are depressed, distinct, not thickened or limbate and the intercameral sutures are slightly curved. The ventral sutures are distinct, depressed and nearly radial; they are not thickened or limbate. The periphery of each chamber bears two weak, widely spaced carinae bordering the imperforate peripheral band. The dorsal carina does not appear to extend along the dorsal intercameral suture. The ventral carina on the last chamber is reflected along the apertural face but becomes weak and indistinct above the aperture; it is difficult to see the umbilical extension of the ventral carina on any chamber except the last formed. The umbilicus is broad and deep; the primary aperture opens into the umbilicus and is bordered by an asymmetric lip-like flap (porticus, see Banner and Blow, 1959). Relict parts of the primary apertures of the earlier chambers of the last whorl remain open into the umbilicus. The imperforate fragile tegillum, observed in the d'Orbigny collections as well as in our own topotypic specimens, is missing on the lectotype. The wall is calcareous, apparently radial in structure, and is uniformly and finely perforate except for the imperforate area between the carinae. The surface of the test is hispid, the hispidity being greatest along the umbilical margins of the chambers. 

Entries in the Catalog of original descriptions: Globigerina cretacea, Globotruncana globigerinoides, Globigerina cretacea saratogaensis, Globotruncana (Rugoglobigerina) loetterli subloetterli, Rosalinella globigerinoides

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:-
sp chamber shape:Globularcoiling axis:Lowperiphery:Double keelaperture border:Thin lip
umb chbr shape:-umbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Moderately muricateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. gansseri zone (71.73-73.80Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

d'Orbigny, A. (1840). Mémoire sur les foraminiféres de la craie blanche du bassin de Paris. Mémoires de la Société Géologique de France. 4(1): +34+-. gs

Falzoni, F. & Bartolini, A. (2021). Taxonomic re-examination of the Late Cretaceous planktonic foraminiferal species Archaeoglobigerina cretacea (d'Orbigny, 1840) and constraints on its morphologic variability and stratigraphic distribution in one of the type localities (Kent, SE England). Journal of Foraminiferal Research. 51: 46-63. gs

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

Robaszynski, F., Caron, M. & le Groupe de Travail Européen des Foraminifères Planctoniques (1979). Atlas des Foraminiféres Planctoniques du Crétace Moyen (Mer Boréale et Téthys). Cahiers de Micropaléontologie. 1 & 2: 1-185. gs

Robaszynski, F., Caron, M., Gonzales Donoso, J. M., Wonders, A. A. H. & the European Working Group on Planktonic Foraminifera (1984). Atlas of Late Cretaceous globotruncanids. Revue de Micropaléontologie. 26(3-4): 145-305. gs

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Archaeoglobigerina cretacea compiled by the pforams@mikrotax project team viewed: 26-1-2025

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