This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Current identification/main database link: Paragloborotalia Cifelli, 1982
Original Description
Jenkinsella includes the lineage from Gr. opima to Gr. semivera to Gr. bella to Gr. mayeri to Gr. acrostoma (Text Fig. 19). All of these forms are linked by intermediate morphotypes.
The primary diagnostic features common to all species included within Jenkinsella are that all have a rounded periphery lacking a distinct carina, globular to subglobular chambers arranged in a compact, low trochospire, and an umbilical-extraumbilical aperture bordered by a rim. The surface ultrastructure of Jenkinsella is marked by a dense network of pores surrounded by thickened walls producing a cancellate surface pattern (PI. 42, Fig. 1).
The Jenkinsella lineage seems to have evolved from "Globorotalia" nana like many of the Neogene globorotaliids. Jenkinsella is largely a Neogene lineage and is an important element of the Early and Middle Miocene foraminiferal assemblages. The extinction of Jenkinsella at the top of Zone N14 (late Middle Miocene) provides a useful datum at 11.2 Ma.
Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gsReferences:
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Jenkinsella compiled by the pforams@mikrotax project team viewed: 10-12-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=132519 Go to Archive.is to create a permanent copy of this page - citation notes |
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