Diploteichus praesigmoides
Set number: 1328
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Set number: 1327
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Set number: 1326
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Set number: 1325
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Set number: 1324
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Set number: 1323
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Zeugrhabdotus praesigmoides Burnett, 1997c
In plan view under cross-polarised light, the outer wall remains in constant extinction, whereas the inner wall and transverse bar exhibit first-order white interference colours. The transverse bar is constructed of four longitudinal segments, and the diagonal segments exhibit similar optical properties.
Species of Diploteichus are characterised by a double wall and a central area spanned by a transverse bar aligned with the short axis and supporting a distal process. In the mobile-mount side view, the outer wall is more prominent than the inner wall. Both walls are triangular in profile, but their apices point in opposite directions: the apex of the outer wall is oriented proximally, whereas that of the inner wall is oriented distally.
Burnett, J. A., 1997c. New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research 19(2), 133-146.
Holotype
Zeugrhabdotus praesigmoides
Burnett, 1997c
Late Campanian - Early Maastrichtian
DSDP Leg 25, Site 249, Mozambique Channel (Davie Ridge), Indian Ocean