pforams@mikrotax - Ventilabrella austinana pforams@mikrotax - Ventilabrella austinana

Ventilabrella austinana

Classification: pf_mesozoic -> Heterohelicidae -> Ventilabrella -> Ventilabrella austinana
Sister taxa: V. austinana, V. eggeri, V. ornatissima, V. sp.


Citation: Ventilabrella austinana Cushman 1938
taxonomic rank: Species
Basionym: Ventilabrella austinana

Type images:

Original description: "Test with a large series of biserial chambers and but few expanded chambers in the adult, typically of but two rows, compressed; chambers globular in the later portion, uniformly increasing in size; sutures slightly depressed; wall smooth, punctate. Length 0.45 - 0.55 mm.; breadth 0.45 - 0.50 mm.; thickness 0.15 - 0.20 mm. "The species differs from V. eggeri in the fewer and larger adult chambers and smooth surface without costae."

Entries in the Catalog of original descriptions: Ventilabrella austinana

Character matrix
test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Multiple
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4-5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.91-92.56Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Cushman, J. A. (1938). Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research. 14: 2-28. gs


Ventilabrella austinana compiled by the pforams@mikrotax project team viewed: 8-12-2023

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