Taxonomy
Original description: Gorbachikella depressa differs from G. kugleri in having a more depressed periphery of each chamber, a very low symmetrical axiointraumbilical aperture with a very weak rim, and a higher spire. The aperture is similar to the Conoglobigerina- type aperture, but the surface of the test is smooth and microperforate (see Pl. 3 , fig. 3b, 4b).
Entries in the Catalog of original descriptions: Gorbachikella depressa
Emended description:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
sp chamber shape: | Inflated | coiling axis: | Moderate | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within Aptian Stage (113.20-121.40Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within Hauterivian Stage (126.50-132.60Ma, base in Hauterivian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
BouDagher-Fadel, M., Banner, F. T., Bown, P. R., Simmons, M. D. & Gorbachik, T. N. (1995). Gorbachikella from the Hauterivian, Barremian-Aptian of Tunisia. Revue de Micropaléontologie. 38(3): 179-193. gsReferences:
Gorbachikella depressa compiled by the pforams@mikrotax project team viewed: 15-12-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110206 Go to Archive.is to create a permanent copy of this page - citation notes |
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