Structural Analysis of Flanged Coccoliths in Sediments from the South West Pacific Ocean
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D.A. Burns [1]
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[1] New Zealand Oceanographic Institute, Wellington, New Zealand
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- Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 5, Nº. 1, 1973, págs. 147-160
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
The analysis of the structure of «flanged» coccoliths found in a number of South West Pacific bottom sediments shows most of these forms have similar features. On these features these coccoliths which have previously been described under the genus Discolithus or Discolithina have been attributed to the genus Pontosphaera Lohmann, 1902 following the emendation of this genus to define it in terms of the specific constructional characters of its flange and two-layered central area construction as recognised on the electron microscope. In this way Pontosphaera is separated from other flanged genera. Analysis of central area perforation arrangements in the flanged coccoliths affords a reassessment of the specific parameters defining coccoliths within the genus Pontosphaera emended. In this way several species are emended with redescription in terms of features seen on the electron microscope, with an accurate assessment of the variation of structural features within each species. This critical evaluation of the members of each species has led to a reappraisal of previous synonomies and one new species Pontosphaera pacifica has been described.
