Taxonomy
Original description: Gorbachikella grandiapertura differs from G. kugleri in having a very convex spiral side, five chambers in the first whorl which reduces to four chambers in the whorl in the last two whorls (instead of only four chambers in each whorl throughout the test) and an axiointraumbilical aperture but with a much higher symmetrical (see Pl. 4 , fig. I b-2 b) to slightly asymetrical arch (see PI. 4 , fig. 3a, 4 b, 5a).
Entries in the Catalog of original descriptions: Gorbachikella grandiapertura
Emended description:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
sp chamber shape: | Inflated | coiling axis: | Low-moderate | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | Wide | 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 Barremian Stage (121.40-126.50Ma, top in Barremian 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:
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Gorbachikella grandiapertura compiled by the pforams@mikrotax project team viewed: 14-2-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110207 Go to Archive.is to create a permanent copy of this page - citation notes |
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