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| Krijnen, J.P.. |
| In the present paper, certain morphological features and the ontogenetical development of members of the subfamily Pseudorbitoidinae Rutten, 1935 are discussed. A study of the evolution of Pseudorbitoides Douvillé, 1922 resulted in testing the concept of nepionic reduction in populations of this genus from Jamaica (Green Island- and Sunderland Inlier) and Curaçao (Cas Abao Limestone lenses). Within the Pseudorbitoides-lineage, P. trechmanni pectinata subsp. nov. is distinguished from P. trechmanni trechmanni Douvillé on account of different post-juvenile features. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/317459 |
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| Krijnen, J.P.. |
| Pseudorbitoid foraminifera from Glenbrook area, Jamaica, are analysed and identified as Pseudorbitoides trechmanni trechmanni Douvillé, 1922 in sample J 4044, and as P. trechmanni trechmanni or P. israelskyi Vaughan & Cole, 1932 in sample J 4043. The present author disagrees with Cole & Applin's conclusions concerning the arrangement of juvenile chambers in P. trechmanni trechmanni and is of the opinion that their definition of this form has to be withdrawn. He favours Brönnimann's principles of subdividing Pseudorbitoides (1954-1958) on the basis of stages of nepionic reduction, resulting in a distinction of species according 1) to a shift in the distribution of the number of primary chambers in exclusively uniserial populations, and 2) to a... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/317546 |
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