Cretarhabdus barremianus
SEM photo of Cretarhabdus barremianus from Wind & Wise, 1977 (Pl. 69, Fig. 2)
Set number: 3013
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Set number: 3012
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10µm
Cretarhabdus barremianus Black, 1971a
The entire species exhibits first-order, slightly greyish-white interference colours. The pelaga of Cretarhabdus barremianus exhibits inclined extinction and length-slow (+) elongation in their natural settling position, in plan view under crossed polars.
Species of Cretarhabdus are constructed of cretarhabdid shields and a tube cycle surrounding a large central area, with lateral bars delimiting approximately 12 pores in the outer cycle and supporting a distal process that often bears a large calix.
Black, M. 1971a. Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society 38: 381-424.
Holotype
Cretarhabdus barremianus
Black, 1971a
Barremian
Speeton Clay at Speeton, England