Taxonomy
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]
Original 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:
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: | 6-6.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within G. algerianus zone (116.86-118.24Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within L. cabri zone (119.05-120.55Ma, base in Aptian 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 maslakovae compiled by the pforams@mikrotax project team viewed: 12-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110251 Go to Archive.is to create a permanent copy of this page - citation notes |
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