Taxonomy
Original description: "Test medium size, formed by 3 whorls; peipheral margin stellate; 5-6 chambers in the last whorl, increasing gradually in size as added; chambers ovoid to semi-elongate on both spiral and umbilical sides, spherical to ovoid in peripheral view; sutures radial, straight to slightly curved, depressed on both spiral and umbilical sides; umbilicus wide and shallow; relict apertural flaps frequently observed umbilically."
Entries in the Catalog of original descriptions: Hedbergella bollii
Character matrix
test outline: | Stellate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Subtriangular | coiling axis: | Very low | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Subtriangular | umbilicus: | Narrow | periph margin shape: | Moderately rounded | accessory apertures: | Relict |
spiral sutures: | Strongly depressed | umb depth: | Shallow | wall texture: | Finely pustulose | shell porosity: | |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 5-6 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within G. ferreolensis zone (118.24-118.56Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. blowi zone (120.55-124.40Ma, base in Barremian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gsReferences:
Hedbergella bollii compiled by the pforams@mikrotax project team viewed: 14-12-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110239 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