Original description: "Test biserial, laterally compressed, gradually expanding from initial end. Chambers 14-15 in number, slightly inflated, with tendency toward reniform shape in gerontic stage, earlier chambers wider than broad. Wall very finely perforate. Pores in single rows between costae. Surface finely and abundantly costate. Primary aperture narrow, moderatly arched. Accessory apertures on tubelike chamber extensions in interiosutural position of ephebic stage. Sutures of juvenile stage straight, normal to edge, but convex toward the aperture in adult."
Entries in the Catalog of original descriptions: Pseudoguembelina costellifera
|test outline:||Subtriangular||chamber arrangement:||Biserial||edge view:||Compressed||aperture:||Interiomarginal|
|sp chamber shape:||Subrectangular||coiling axis:||N/A||periphery:||N/A||aperture border:||Thin flange|
|umb chbr shape:||Subrectangular||umbilicus:||N/A||periph margin shape:||Narrowly rounded||accessory apertures:||Sutural|
|spiral sutures:||Moderately depressed||umb depth:||N/A||wall texture:||Finely costate||shell porosity:|
|umbilical or test sutures:||Moderately depressed||final-whorl chambers:||2.0-2.0||N.B. These characters are used for advanced search. N/A - not applicable|
Last occurrence (top): within G. gansseri zone (71.75-72.97Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.56-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Pseudoguembelina costellifera compiled by the pforams@mikrotax project team viewed: 30-11-2022
Short stable page link: https://mikrotax.org/pforams/index.php?id=110450 Go to Archive.is to create a permanent copy of this page - citation notes
The upper range of Psg. costellifera is based on observations by Nederbragt (1991) who shows the species ranging into the Globotruncanella havanensis Zone, with a dashed range into the Ga. gansseri Zone. If you have an published range extending into the mayaroensis Zone please send the publication with an illustrated specimen to firstname.lastname@example.org.