Specimens which cannot be assigned to established species
| 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
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): 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 range and occurrence data:
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. gsReferences:
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Sigalia compiled by the pforams@mikrotax project team viewed: 27-10-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=110529 Go to Archive.is to create a permanent copy of this page - citation notes |
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