holotype: Globigerina quadricamerata
Taxonomy
holotype: Globigerina quadricamerataOriginal description: Test small, with a low coil, rounded in outline, with a broadly rounded lobate peripheral margin. Consists of 10-11 chambers, forming 2-2.5 whorls. In the last whorl are 4-5 spherical chambers, freely in contact. Chambers increase in size as added more or less uniformly, but the last one is sometimes a little shorter than the preceding chamber and stretches out upwards. Sutures deep, very slightly curved. Umbilical region open, depressed. Aperture umbilical with a small lip in the form of a narrow curved lamina. Wall finely perforate, smooth, opaque.
Entries in the Catalog of original descriptions: Globigerina quadricamerata
Geological Range:
Last occurrence (top): within Aptian Stage (112.95-126.30Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within Aptian Stage (112.95-126.30Ma, 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: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
| sp chamber shape: | Globular | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
| 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: | 4.0-5.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Antonova, Z. A., Shmigina, T. A., Gnedina, A. G. & Kalugina, O. M. (1964). Neokom i apt Mezduretsiya Pshekha-Ubin (Severo-Zapadnii Kavkaz). Voprosy stratigrafii i litologii mezozoiskikh i kainozoiskikh otlozhenii Krasodarskogo Kraya. [Foraminifera of the Neocomian and Aptian of the Psheka-Ubin interfluve (NW Caucasus)]. Trudy Vsesoyuznogo Neftegazovogo Nauchno-issledovatelskogo Instituta, Krasnodarskiy Filial. 12: 3-72. gs :: :: References:
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Hedbergella quadricamerata compiled by the pforams@mikrotax project team viewed: 9-7-2020
Short stable page link: http://mikrotax.org/pforams/index.php?id=110259 Go to Archive.is to create a permanent copy of this page - citation notes |