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.
Linked specimens: USNM-320479 USNM-320480 USNM-320478 USNM-320476 USNM-320477
Current identification/main database link: Globorotalia challengeri Srinivasan & Kennett 1981
Remarks: The new species differs from its ancestor, G. praescitula in exhibiting five to five and one-half rather than four and one- half chambers in the final whorl, more inflated chambers and a more rounded periphery. The species is also morphologically similar to G. mayeri but differs in being less elongate in equatorial profile and in exhibiting a distinctly low-arched aperture. Evolution: An evolutionary gradation was observed in Site 281 from G. praescitula in the latest Early Miocene to G. challengeri in the early Middle Miocene (Fig. 14). The upward gradation is recorded between Cores 12 and 9. The upward gradation largely involves an increase in the number of chambers, greater inflation of the test and rounding of the periphery. The evolutionary change takes place over a period of about. 2 m.y. from the lower part of the G. miozea Zone (~18 Ma) to the base of the Orbulina suturalis Zone (16 Ma).
Original Description
Extra details from original publication
Globorotalia challengeri compiled by the pforams@mikrotax project team viewed: 9-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=131093 Go to Archive.is to create a permanent copy of this page - citation notes |
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