Zygodiscus clausus
Set number: 1954
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10µm
In the mobile mount
Set number: 1953
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10µm
Set number: 1952
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10µm
Set number: 1951
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10µm
Set number: 1950
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10µm
Zygodiscus clausus Romein, 1977
A species of Zygodiscus characterised by an axial or nearly axial, multi-segmented, elongated disjunct bar that fully spans the central area. The bar displays symmetrical extinction, dim at 45° and brightest at 0°. The narrow outer wall remains in constant extinction, while the inner wall shows first-order white to yellow interference colours, with dextrogyre inclined extinction lines and length-fast (−) elongation on the distal side.
Romein, A. J. T., 1979. Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin 22, 1-231.
Holotype
Zygodiscus clausus
Romein, 1979
Late Paleocene
Barranco del Gredero. Caracava, Spain