pforams@mikrotax - Globotruncanella compressiformis

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:

holotype: P. hessi compressiformis
holotype: P. hessi compressiformis

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: Circular chamber arrangement: Trochospiral edge view: Equally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Elongate coiling axis: Very low periphery: N/A aperture border: Thin flange
umb chbr shape: Globular umbilicus: Wide periph margin shape: Subangular accessory apertures: Umbilical
spiral sutures: Moderately depressed umb depth: Shallow wall texture: Smooth shell porosity: Finely Perforate: 1-2.5µm
umbilical or test sutures: Moderately depressed final-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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globotruncanella

References:

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

Globotruncanella compressiformis compiled by the pforams@mikrotax project team viewed: 6-3-2026

Taxon Search:

Advanced Search

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

test outline:	Circular	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Elongate	coiling axis:	Very low	periphery:	N/A	aperture border:	Thin flange
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Subangular	accessory apertures:	Umbilical
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.5-5.5	N.B. These characters are used for advanced search. N/A - not applicable