Taxonomy
Original description: Test small, tightly coiled, turret-shaped, rounded in outline. Consists of 2-2.5 whorls, in the last of which are 4 round chambers, closely appressed. Chambers of initial whorl very small, later chambers much larger, do not always increase evenly in size and have nearly uniform dimensions, the last chamber is sometimes even smaller than the penultimate one. Sutures not very deep, nearly straight. Aperture umbilical, covered by a thin broad lamina, usually covering the entire umbilical region of the test. Wall smooth, finely perforate, opaque.
Entries in the Catalog of original descriptions: Globigerina tardita
Character matrix
test outline: | Quadrate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | High | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Weakly depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Weakly 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 Barremian Stage (121.40-126.50Ma, base in Barremian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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. gsReferences:
Hedbergella tardita compiled by the pforams@mikrotax project team viewed: 13-10-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110267 Go to Archive.is to create a permanent copy of this page - citation notes |
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