Cismon-120.JPG
Cismon-120.JPGTaxonomy
This species displays a small morphological variability mainly regarding the number of chambers (6 to 6.5) in the outer whorl, their elongation degree and the spiral side which may range from low to flat. [copied from Chronos database]
holotype: Hedbergella maslakovae
holotype: Hedbergella maslakovae
holotype: Hedbergella maslakovae
paratype: Hedbergella maslakovaeOriginal description: Medium sized, test as with genus; consisting of 3 whorls; spiral side convex; peripheral margin circular, strongly lobate; 6-7 chambers in the last whorl; chambers inflated, ovoid to semi-elongate; spherical to ovoid in peripheral view; sutures radial, slightly curved on both spiral and umbilical sides; primary aperture extraumbilical to spiroumbilical, a low equatorial arch bordered by an imperforate porticus; relict apertures and flaps present on both spiral and umbilical sides; umbilical area wide; penultimate whorl partly exposed.
Entries in the Catalog of original descriptions: Hedbergella maslakovae
Emended description: Test medium sized, trochospirally coiled; 6 to 6.5 chambers in the outer whorl, increasing very slowly and gradually in size as added; chambers initially globular to subglobular, the last three or four tending to become slightly radially elongate, round at their end; spiral side very low to flat; peripheral outline subcircular, strongly lobate; sutures straight to slightly curved on both spiral and umbilical sides; umbilicus broad and shallow; aperture as a low extraumbilical arch reaching the periphery. Wall smooth and finely perforate. [copied from Chronos database]
Geological Range:
Last occurrence (top): within G. algerianus zone (118.93-122.17Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within L. cabri zone (123.89-125.71Ma, base in Aptian 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
Character matrix
| test outline: | Stellate | 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: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Relict |
| spiral sutures: | Strongly depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 6.0-6.5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gsReferences:
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Hedbergella maslakovae compiled by the pforams@mikrotax project team viewed: 22-2-2020
Short stable page link: http://mikrotax.org/pforams/index.php?id=110251 Go to Archive.is to create a permanent copy of this page - citation notes |