pforams@mikrotax - Abathomphalus intermedius pforams@mikrotax - Abathomphalus intermedius

Abathomphalus intermedius

Classification: pf_mesozoic -> Globotruncanidae -> Abathomphalus -> Abathomphalus intermedius
Sister taxa: A. intermedius, A. mayaroensis, A. sp.


Citation: Abathomphalus intermedius (Bolli, 1951)
taxonomic rank: Species
Basionym: Globotruncana intermedius
Synonyms: Globotruncana intermedia difformis; Globotruncana hanzawai; Globotruncana pessagnoi

Type images:

Original description: The test is usually slightly convex on the dorsal side, flat or often slightly convex ventrally, and distinctly lobate, but this is less pronounced than in G. citae. The five, occasionally four, chambers of the last whorl usually possess a marked peripheral edge or keel, and sometimes a second keel is developed (transition to G. mayaroensis). The sutures on the dorsal side are distinctly curved, whereas ventrally they are radial. The chambers often appear slightly inflated and a few show striations, which are radial on the ventral side and more tangential dorsally. The state of preservation of the specimens so far examined has not allowed detailed study of the aperture or apertures, which probably open into the umbilicus.

Entries in the Catalog of original descriptions: Globotruncana intermedia, Globotruncana intermedia difformis, Globotruncana hanzawai, Globotruncana pessagnoi

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Coalescing portici
umb chbr shape:Petaloidumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.3Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.3-69.18Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Bolli, H. M. (1951b). The genus Globotruncana in Trinidad. Journal of Paleontology. 25(2): 187-199. 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


Abathomphalus intermedius compiled by the pforams@mikrotax project team viewed: 4-12-2023

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