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Sigalia


Classification: pf_mesozoic -> Heterohelicidae -> Sigalia
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)




Specimens which cannot be assigned to established species

Taxonomy

Citation: Sigalia Reiss 1957
Rank: Genus
Basionym: Guembelina deflaensis
Type species: Guembelina deflaensis Sigal, 1952
Taxonomic discussion: The specimen shown in the top two figures of fig. 41 of Sigal (1952, *2917) was designated as the lectotype of Sigalia deflaensis (Sigal) by Salaj and Samuel (1963, *2715, p. 100), who restricted the genus as entirely biserial. However, both Reiss (1957, *2555) and Dowsett (1984, *1004, p. 133) noted that occasional chamber proliferation might occur and regarded the raised and beaded sutures as most characteristic of the genus.

Type images:

Original description: Sigalia:

Entries in the Catalog of original descriptions: Sigalia;

Short diagnosis: Test subtriangular in outline, compressed, biserial throughout, sutures moderately inflated but not globular, terminal face appearing truncate because of the elevated and beaded sutures; wall calcareous, surface with low and discontinuous ribs and distinctly perforate between the raised and strongly beaded sutures; aperture an arch at the base of the final chamber.

Geological Range:
Last occurrence (top): within Santonian Stage (83.64-86.26Ma, top in Santonian 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:

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., (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York, 1059 pp.


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Sigalia compiled by the pforams@mikrotax project team viewed: 26-9-2017

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