Taxonomy
Original description: Test large, coiled in a low to medium high trochospire consisting of 3 whorls; peripheral margin circular, lobate; 6-7 chambers in the last whorl, increasing gradually in size as added; chambers globular, somewhat ovoid on both spiral and umbilical sides; chambers on umbilical side separated by deeply incised sutures; spherical in peripheral view; sutures radial, slightly curved on both spiral and umbilical sides; primary apertures extraumbilical-spiroumbilical bordered by an imperforate flap; umbilicus circular, deep.
Entries in the Catalog of original descriptions: Hedbergella occulta, Blefuscuiana globigerinellinoides lobulata, Blefuscuiana multicamerata, Blefuscuiana occulta quinquecamerata
Emended description:
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | - |
sp chamber shape: | Inflated | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | N/A |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Perforation cones | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 6-6.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within P. rohri zone (113.22-116.60Ma, top in Aptian stage). Data source: copied from Chronos database, but zonal name updated from T. bejaouaensis to T. rohri
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:
Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gsReferences:
Hedbergella occulta compiled by the pforams@mikrotax project team viewed: 11-10-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110255 Go to Archive.is to create a permanent copy of this page - citation notes |
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