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Racemiguembelina


Classification: pf_mesozoic -> Heterohelicidae -> Racemiguembelina
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 0-300Ma)
Sample: DSDP Leg 3, 21-3-1, 0-2 cm
Geological Age: Cretaceous '>


Taxonomy

Citation: Racemiguembelina Montanaro Gallitelli 1957
Rank: Genus
Basionym: Guembelina fructicosa
Type species: Guembelina fructicosa Egger, 1902

Type images:

Original description: Racemiguembelina:

Entries in the Catalog of original descriptions: Racemiguembelina;

Short diagnosis: Test subconical, microspheric early stage may be planispiral and later stage biserial, regularly enlarging globular chambers proliferate in the later stage in a plane perpendicular to the earlier plane of growth, forming an open cone only partially joined by a bridgelike coverplate, sutures depressed; wall calcareous, hyaline, surface with longitudinal irregular to discontinuous imperforate costae, alternating with distinctly perforate areas of the wall, coverplate over the apertures with much finer perforations; aperture consists of broad arched interiomarginal openings directed toward the umbilicus on all chambers in the final whorl, apertures may be partially covered by the bridge like cover plate that extends from one apertural face to another in the same series of chambers, each coverplate bordered by large infralaminal accessory apertures.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

References:

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


Racemiguembelina compiled by the pforams@mikrotax project team viewed: 26-6-2017

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