Taxonomy
Original description: Early chambers biserial, gradually to rapidly increasing in size when added, followed by up to 6 sets of multiserial chambers. Individual chambers and chamberlets subglobular, wider than high or deep; sutures of earlier chambers raised above the surface of the test. Chamber surface as well as sutures covered by thin to thick costae; ornamentation and raised sutures more strongly developed on the early part of the test. Apertures a simple arc, bordered by small flanges.
Entries in the Catalog of original descriptions: Sigalia deflaensis rugocostata
Character matrix
test outline: | Subtriangular | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Multiple |
sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
umb chbr shape: | Inflated | umbilicus: | N/A | periph margin shape: | N/A | accessory apertures: | None |
spiral sutures: | Raised beaded | umb depth: | N/A | wall texture: | Finely costate | shell porosity: | |
umbilical or test sutures: | Raised beaded | final-whorl chambers: | 4-7 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gsReferences:
Sigalia rugocostata compiled by the pforams@mikrotax project team viewed: 10-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110533 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments (2)
Citation: Sigalia rugocostata (Nederbragt, 1991) no brackets needed no genus transfer.
thanks!