Taxonomy
Original description: Test small to medium size, formed by about 3 whorls; earlier whorls coiled in higher plane than final whorl; peripheral margin circular; generally with 6 chambers in the last whorl, increasng gradually in size as added; chambers spherical to ovoid on both spiral and umbilical sides; spherical in peripheral view; ultimate chamber protruding towards the umbilicus; sutures radial, straight, depressed on both spiral and umbilical sides; umbilicus narrow and circular.
Entries in the Catalog of original descriptions: Hedbergella excelsa
Emended description:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | - |
sp chamber shape: | Inflated | coiling axis: | Moderate-high | 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: | Smooth | 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): at top of P. rohri zone (95% up, 113.4Ma, in Aptian stage). Data source: Huber and Leckie, 2011
First occurrence (base): within G. blowi zone (120.55-124.40Ma, base in Barremian stage). Data source: Coccioni and Premoli Silva, 1994
Plot of range and occurrence data:
Huber, B. T. & Leckie, R. M. (2011). 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. Journal of Foraminiferal Research. 41: 53-95. gs Longoria, J. F. (1974). Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gsReferences:
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Hedbergella excelsa compiled by the pforams@mikrotax project team viewed: 13-7-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110241 Go to Archive.is to create a permanent copy of this page - citation notes |
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