Sigalia rugocostata

Classification: pf_mesozoic -> Heterohelicidae -> Sigalia -> Sigalia rugocostata
Sister taxa: S. carpatica, S. decoratissima, S. deflaensis, S. rugocostata, S. sp.,


Citation: Sigalia rugocostata Nederbragt, 1991
Rank: Species
Basionym: Sigalia deflaensis rugocostata
Taxonomic discussion: As in the biserial S. deflaensis, there is considerable variation in the strength of the ornamentation and in the extent to which the sutures are raised. Forms with only slightly raised sutures grade into V. eggeri, and forms with strongly raised sutures and very fine costae grade into S. decoratissima. However, the complete range of variation is not found in a single sample. In the El Kef section, S. rugocostata is accompanied by common V. eggeri, and rare specimens that are transitional to S. decoratissima. In samples that contain a S. decoratissima population, S. deflaensis and S. rugocostata are very rare and V. eggeri specimens are absent. [copied from Chronos database]

Type images:

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

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (84.19-86.71Ma, base in Coniacian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Sigalia

    Character matrix

    test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Multiple
    sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
    umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:N/Aaccessory apertures:None
    spiral sutures:Raised beadedumb depth:N/Awall texture:Finely costateshell porosity:
    umbilical or test sutures:Raised beadedfinal-whorl chambers:4.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable


    Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs :: ::


    Sigalia rugocostata compiled by the pforams@mikrotax project team viewed: 15-8-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110533 Go to Archive.is to create a permanent copy of this page - citation notes

    Comments (1)

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    Le Coze

    Citation: Sigalia rugocostata (Nederbragt, 1991) no brackets needed no genus transfer.

    Jeremy Young (UK)


    Page 1 of 1

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