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Planoglobulina carseyae


Classification: pf_mesozoic -> Heterohelicidae -> Planoglobulina -> Planoglobulina carseyae
Sister taxa: P. acervulinoides, P. brazoensis, P. browni, P. carseyae, P. manuelensis, P. multicamerata, P. riograndensis, P. sp.

Taxonomy

Citation: Planoglobulina carseyae (Plummer, 1931)
Rank: Species
Basionym: Ventilabrella carseyae
Taxonomic discussion: Planoglobulina carseyae is one of the two species of this genus in which the earlier biserial stage is of Heterohelix type. Refigured holotype below is relevant. [copied from Chronos database]

Type images:

Original description: Test V-shaped, laterally somewhat compressed, composed throughout much of its development of appressed, well-in­ flated, distinctly striate biserial chambers that increase rapidly in size with growth, later chambers arranged ir­ regularly in the plane of biseriality forming a fully mature test that is somewhat fan-shaped in peripheral outline; sutures deeply incised; aperture a broad lunate opening at base of septal face of biserial portion of test and a similar opening on each side of many of the later chambers.

Entries in the Catalog of original descriptions: Ventilabrella carseyae


Emended description: Biserial chambers deeper than wide followed by one or two sets of multiserial chamberlets. Test V-shaped, laterally somewhat compressed, composed throughout much of its development of appressed, well-inflated, distinctly striate biserial chambers that increase rapidly in size with growth, later chambers arranged irregularly in the plane of biseriality forming a fully mature test that is somewhat fan-shaped in peripheral outline; sutures deeply incised; aperture a broad lunate opening at base of septal face of biserial portion of test and a similar opening on each side of many of the later chambers. [copied from Chronos database]

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74.00-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Biapertural
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:N/Aaccessory apertures:None
spiral sutures:Strongly depressedumb depth:N/Awall texture:Finely costateshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:2.0-3.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Martin, S. E. (1972). Reexamination of the Upper Cretaceous planktonic foraminifera genera Planoglobulina and Ventilabrella Cushman. Journal of Foraminiferal Research. 2(2): 73-92. gs

Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O

Plummer, H. J. (1931b). Some Cretaceous foraminifera in Texas. University of Texas Bulletin. 3101: 109-203. gs

Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs V O


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Planoglobulina carseyae compiled by the pforams@mikrotax project team viewed: 21-4-2021

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110394 Go to Archive.is to create a permanent copy of this page - citation notes



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