pforams@mikrotax - Globotruncanella compressiformis pforams@mikrotax - Globotruncanella compressiformis

Globotruncanella compressiformis


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

Taxonomy

Citation: Globotruncanella compressiformis (Pessagno, 1962)
taxonomic rank: Species
Basionym: Praeglobotruncana hessi compressiformis

Type images:

Original description: Spiral side flattened to gently convex; periphery lobulate chambers increasing rapidly in size; nepionic chambers spherical; later chambers becoming markedly ovate and highly compressed; early chambers coarsely spirose; last 2-3 chambers smooth, often a modified hemispherical shape with a sharp dorsal keel which appears to be radial, hyaline, perforate; sutures depressed, radial, slightly curved on both spiral and umbilical sides; aperture interiomarginal; appears to be a low arch, extraumbilical in position; large umbilical flaps extend into a broad umbilicus from each chamber.

Entries in the Catalog of original descriptions: Praeglobotruncana hessi compressiformis

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin flange
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Umbilical
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5┬Ám
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 Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within Maastrichtian Stage (66.04-72.17Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Pessagno, E. A. (1962). The Upper Cretaceous stratigraphy and micropaleontology of south-central Puerto Rico. Micropaleontology. 8(3): 349-368. gs


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Globotruncanella compressiformis compiled by the pforams@mikrotax project team viewed: 14-6-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110180 Go to Archive.is to create a permanent copy of this page - citation notes



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