Zygodiscus herlyni
Set number: 1957
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10µm
In the mobile mount
Set number: 1955
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10µm
Set number: 1956
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10µm
Zygodiscus herlynii Sullivan, 1964
A species of Zygodiscus characterised by a transverse bar made up of two halves, each formed by two segments. The narrow outer wall remains in constant extinction, while the inner wall exhibits first-order white interference colours, with dextrogyre inclined extinction lines and length-fast (−) elongation on the distal side. The transverse bar displays length-slow (+) elongation on the distal side.
Sullivan, F. R., 1964. Lower Tertiary nannoplankton from the California Coast Ranges. I. Paleocene. University of California Publications in Geological Sciences 44, 163-227.
Holotype
Zygodiscus herlyni
Sullivan, 1964
Late Paleocene
Anita Shale, Santa Barbara County, California, USA