pforams@mikrotax - Globotruncanella minuta pforams@mikrotax - Globotruncanella minuta

Globotruncanella minuta


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncanella -> Globotruncanella minuta
Sister taxa: G. compressiformis, G. havanensis, G. minuta, G. petaloidea, G. pschadae, G. semsalensis, G. sp.

Taxonomy

Citation: Globotruncanella minuta Caron&Gonzalez Donoso in Robaszynski et al., 1984
taxonomic rank: Species
Basionym: Globotruncanella minuta

Type images:

Original description: "Umbilical Side -Primary aperture extraumbilical-umbilical. -Sutures radial, depressed. -4 to 4.5 chambers, globular, with a surface bearing pustules, more numerous on the first chambers. -Umbilicus: less than 1/4 of the maximum diameter. -Umbilical system composed of portici, well developed, sometimes free, often merging at the umbilical and/or posterior edges. Spiral Side. -Outline lobate to strongly lobate. -Sutures radial, depressed, joining the spiral sutures at right angles. -Chambers globular, with a surface bearing pustules, more developed on the first chambers of the last whorl. First whorls depressed in respect to the last whorl. -Chambers increasing very rapidly in size as added. Lateral View. -Trochospire very low, tending to planispiral. -Profile almost symmetrical; periphery broadly rounded throughout without any patterns. Size: 0.15 to 0.30 mm. Holotype: 0.30 mm."

Entries in the Catalog of original descriptions: Globotruncanella minuta

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Coalescing portici
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Coarsely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. gansseri zone (71.73-73.80Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

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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Globotruncanella minuta compiled by the pforams@mikrotax project team viewed: 19-6-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110183 Go to Archive.is to create a permanent copy of this page - citation notes



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