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Sigalia

Classification: pf_mesozoic -> Heterohelicidae -> Sigalia
Sister taxa: Heterohelix, Spiroplecta ⟩⟨ Braunella, Hendersonites, Huberella, Laeviheterohelix, Planoheterohelix, Protoheterohelix, Pseudoguembelina, Pseudotextularia ⟩⟨ Planoglobulina, Ventilabrella, Gublerina, Praegublerina, Sigalia, Racemiguembelina ⟩⟨ Lunatriella, Rectoguembelina, Zeauvigerina

Daughter taxa (time control age-window is: 0-800Ma)
			Sigalia carpatica
			Sigalia decoratissima
			Sigalia deflaensis
			Sigalia rugocostata
			Sigalia sp. Specimens which cannot be assigned to established species

Taxonomy

Citation: Sigalia Reiss 1957

taxonomic rank: Genus

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.

Original description: Test compressed, biserial, rarely tending to add more than one chamber per series (row) in very late stages; wall structure calcareous, perforate; sutures limbate, covered by prominent rows of raised beads, giving the apertural end of each chamber a 'truncated' character; aperture arched, half-moon-shaped, in basal position at the inner margin of the chamber ('guembelinid'). Family Guembelinidae.

Entries in the Catalog of original descriptions: Sigalia

Distinguishing features:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Biserial or with chamber proliferation. Sutures rasied and beaded.

Morphology:

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): at top of D. asymetrica zone (100% up, 83.7Ma, in Santonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within D. concavata zone (85.60-89.75Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Heterohelicidae

References:

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

Reiss, Z. (1957a). Notes on foraminifera from Israel. 1. Remarks on Truncorotalia aragonesis caucasica (Glaessner). 2. Loxostomoides, a new late Cretaceous and early Tertiary genus of foraminifera. 3. Sigalia, a new genus of foraminifera. Bulletin Research Council of Israel (Reprinted In Israel Geological Survey Bulletin). 6B: 239-244. gs

Sigalia compiled by the pforams@mikrotax project team viewed: 10-9-2024

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