pforams@mikrotax - Paracostellagerina libyca

Paracostellagerina libyca


Classification: pf_mesozoic -> Hedbergellidae -> Paracostellagerina -> Paracostellagerina libyca
Sister taxa: P. libyca, P. sp.

Taxonomy

Citation: Paracostellagerina libyca (Barr, 1972)
Rank: Species
Basionym: Hedbergella libyca
Synonyms: Hedbergella costellata

Type images:

Original description: "Test biconvex, low trochospiral, evolute, umbilicate, consisting of 3-31/2 whorls; equatorial periphery subcircular, moderately lobulate. Chambers globular, 5-7 (usually 6) in final whorl, uniformly and rapidly increasing in size. Sutures depressed, straight, radial. Umbilicus moderately broad. Aperture an interiomarginal, extraumbilical-umbilical, low arch bordered by well-developed portici. Wall calcareous perforate. Surface strongly rugose, becoming less rugose or hispid on final one or two chambers. Coiling predominantly dextral. Average maximum diameter 0.46 mm."

Entries in the Catalog of original descriptions: Hedbergella libyca, Hedbergella costellata


Emended description:


Morphology:

Wall type:

Size:

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick porticus
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within T. globotruncanoides zone (96.08-100.50Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Barr, F. T. (1972a). Cretaceous biostratigraphy and planktonic foraminifera of Libya. Micropaleontology. 18(1): 1-46. gs

Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs V O


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Paracostellagerina libyca compiled by the pforams@mikrotax project team viewed: 30-11-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110380 Go to Archive.is to create a permanent copy of this page - citation notes



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