Resumé
The indi vidual growth pattern of the planktonic foraminifera Globigerinatheka index (Finlay) is extremely variable, and the taxonomical problems involved are very complex. The different morphotypes displayed by some Danish material of G. index are presented in this paper.
The growth spiral is analysed and compared with the spiral of other taxa referred to as Globigerina sp., Globigerina ex gr. bulloides d'Orbigny , and Globigerina patagonica Todd & Kniker. The appearance of the ultimate chamber is illustrated by graphs of its dimensions, absolutely and relatively. In many specimens the ultimate chamber is displaced from the 'normal' growth spiral. The growth lines representing length versus Breadth of the 'normal' growth spiral are constructed and statistically tested.
The growth spiral is analysed and compared with the spiral of other taxa referred to as Globigerina sp., Globigerina ex gr. bulloides d'Orbigny , and Globigerina patagonica Todd & Kniker. The appearance of the ultimate chamber is illustrated by graphs of its dimensions, absolutely and relatively. In many specimens the ultimate chamber is displaced from the 'normal' growth spiral. The growth lines representing length versus Breadth of the 'normal' growth spiral are constructed and statistically tested.
Originalsprog | Engelsk |
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Titel | DGU Årbog 1974 |
Forlag | DGU |
Sider | 105-138 |
Antal sider | 34 |
Vol/bind | 1974 |
DOI | |
Status | Udgivet - 18 sep. 1975 |
Publikationsserier
Navn | DGU Årbog |
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Vol/bind | 1974 |
Programområde
- Programområde 1: Data