pforams@mikrotax - Costellagerina pilula pforams@mikrotax - Costellagerina pilula

Costellagerina pilula


Classification: pf_mesozoic -> Hedbergellidae -> Costellagerina -> Costellagerina pilula
Sister taxa: C. bulbosa, C. pilula, C. sp.

Taxonomy

Citation: Costellagerina pilula (Belford, 1960)
taxonomic rank: Species
Basionym: Rugoglobigerina (Rugoglobigerina) pilula Belford, 1960
Synonyms:

Type images:

Original description:

Diagnosis: Test trochoid, chambers globular, inflated, arranged in a high spire, 5-6 in last whorl. Sutures depressed, surface of test ornamented with small ridges, on some chambers in a meridional pattern. Aperture interiomarginal umbilical, large.

Description: Test trochoid, both dextrally and sinistrally coiledforms known, with the latter the more common; umbilicus small, circular, usually infilled. Test trochoid, both dextrally and sinistrally coiled forms occurring, with the latter the more common; umbilicus small, circular, usually infilled. chambers globular, strongly inflated, forming two and one-half to three whorls, each whorl only partly overlapping the one preceding, forming a high sire; five or six chambers in last whorl, increasing slowly in size as added. Sutures straight or slightly curved on spiral side, straight on umbilical side, depressed on both sides. Test ornamented with small discontinuous ridges, irregularly arranged on early chambers and forming a meridional pattern on chambers of last whorl, the last one or two chambers may be smooth. Wall of test calcareous, finely perforate, radiate in structure. Aperture interiomarginal umbilical, large and arcuate, not often observed because of infilling umbilicus; only remnants of tegilla have been observed.

Entries in the Catalog of original descriptions: Rugoglobigerina (Rugoglobigerina) pilula, Rugoglobigerina (Rugoglobigerina) plana

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Highperiphery:aperture border:
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Meridional costellaeshell porosity:
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. elevata zone (79.33-83.65Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Belford, D. J. (1960). Upper Cretaceous foraminifera from the Toolonga Calcilutite and Gingin Chalk, Western Australia. Australia Bureau of Mineral Resources Geology and Geophysics, Bulletin. 57: 1-198. gs

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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Costellagerina pilula compiled by the pforams@mikrotax project team viewed: 25-6-2024

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Comments (4)

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Grigore Dan(Niger)

Neagu, Th., 1987, White chalk foraminiferal fauna from Southern Dobrogea (Romania). 1. Planktonic formanifera. Rev.

Española de Micropaleontologia, 19/2, 281–314.

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Jeremy Young(UK)

Grigore

Thank you for taking the time to add a comment, but can you explain a bit more. Does the paper you cite contain the recombinaton of the species, or is  ait someting diferent? Maybe you could send a copy of the PDF - to admin@mikrotax.org

best wishes

Jeremy Young

Avatar
PALEOSEDES(Chad)

Costellagerina

Rugoglobigerina pilula Belford, 1960

Today: Costellagerina pilula (Belford, 1960)AUTOR, YEAR? pleasse

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Jeremy Young(UK)

Fair question. Unfortunately, however, under the ICZN (unlike the ICN/ICBN) the authorship of combinations is not formally recorded, so it is difficult to database or record them and we do not attempt to do so comprehensively on mikrotax. In this case I strongly suspect that the combination was proposed in Petters et al. 1983, but I don't have a copy to hand to check this.

Petters, S.W.; El-Nakhal, H.A. & Cifelli, R., (1983). Costellagerina, a new late Cretaceous Globigerine foraminiferal genus. Journal of Foraminiferal Research, 13(4): 247-251.)