Daughter taxa (time control age-window is: 0-800Ma) | ||||
Blefuscuiana alobata | ||||
Blefuscuiana cumulus | ||||
Blefuscuiana daminiae | ||||
Blefuscuiana depressa | ||||
Blefuscuiana implana | ||||
Blefuscuiana laculata | ||||
Blefuscuiana sp. Specimens which cannot be assigned to established species |
Taxonomy
Original description: Test a low trochospiral of two or more whorls, typically with six or seven chambers in the final whorl, but there may be as few as five or as many as eight. The chambers are subglobular or depressed, reniform or ovoid; they are not radially elongate; spiral side evolute, umbilical side partly involute; aperture intra-extraumbilical, reaching to or even slightly over the periphery of the earlier whorl; the aperture possesses a porticus, of uniform breadth throughout or broadest posteriorly; relict apertures and portici are usually visible in the umbilical parts of the chambers of about half of the last whorl. The wall is microperforate and its surface is smooth, lacking muricae.
Entries in the Catalog of original descriptions: Blefuscuiana
Geological Range:
Last occurrence (top): at top of Aptian Stage (100% up, 113.2Ma, in Albian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Barremian Stage (121.40-126.50Ma, base in Barremian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Banner, F. T. & Desai, D. (1988). A review and revision of the Jurassic-Early Cretaceous Globigerinina,with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England). Journal of Micropalaeontology. 7: 143-185. gs References:
Blefuscuiana compiled by the pforams@mikrotax project team viewed: 12-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110024 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