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Ventilabrella


Classification: pf_mesozoic -> Heterohelicidae -> Ventilabrella
Sister taxa: Braunella, Gublerina, Hendersonites, Heterohelix, Huberella, Laeviheterohelix, Lunatriella, Planoglobulina, Planoheterohelix, Praegublerina, Protoheterohelix, Pseudoguembelina, Pseudotextularia, Racemiguembelina, Rectoguembelina, Sigalia, Spiroplecta, Ventilabrella, Zeauvigerina,
Daughter taxa: (blue => in age window 0-800Ma)



Specimens which cannot be assigned to established species

Taxonomy

Citation: Ventilabrella Cushman 1928
Rank: Genus
Type species: Ventilabrella eggeri Cushman, 1928
Taxonomic discussion: A neotype for Ventilabrella eggeri Cushman (USNM No. 170308) from the Taylor Marl of Texas was designated by S. E. Martin (1972, *2051, p. 86).

Original description: Test in the early stages biserial, later with an increase in the number of chambers, but all in one plane, spread out tn a fan-shape; chambers globular; wall calcareous, perforate, smooth or variously ornamented; aperture in the biserial stage, single at the base of the inner margin, in the adult two apertures in each chamber, at opposite sides near the base in the median line. Upper Cretaceous.

Entries in the Catalog of original descriptions: Ventilabrella

Distinguishing features: Test subtriangular to flabelliform in outline, laterally compressed, chambers globular to pyriform, those of early stage biserially arranged, later with chamber proliferation in the plane of biseriality, sutures distinct, depressed; wall calcareous, hyaline, perforate, surface with longitudinal discontinuous and somewhat irregular low costae; arched basal apertures on both margins of many chambers in the multiseriate stage, cameral flanges present, and these and the cameral ridges may be merged on the final series of chambers.

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


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Ventilabrella compiled by the pforams@mikrotax project team viewed: 29-2-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110566 Go to Archive.is to create a permanent copy of this page - citation notes



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