Orthorhabdus
Cenozoic Taxa
Orthorhabdus serratus
Edited by Lyndsey on Thu, 10/03/2011 - 13:51
Orthorhabdus serratus Bramlette and Wilcoxon, 1967
Description: Triangular-shaped nannolith formed of three blades with c-axis perpendicular to length. The median blade is wider than the two lateral blades and the c-axis lies in the plane of this blade, hence in usual angle of rest the nannolith shows high birefringence, but inverse optical orientation (blue with gysum plate when orientated SW-NE). In alternative orientaton it is symetrical and shows low birefringence.
Typical forms are symmetrical but specimens with a spine developed from the median blade occur in upper part of range.
Remarks:
Original description:
Synonym: Triquetrorhabdulus martinii Gartner, 1967.
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Neogene: Orthorhabdus; Orthorhabdus serratus; Triquetrorhabdulus
Orthorhabdus
Edited by Lyndsey on Thu, 10/03/2011 - 13:50 Genus Orthorhabdus Bramlette and Wilcoxon, 1967
Description: Optical orientation similar to T. rugosus (i.e. with c-axis perpendicular to length), but triangular-shaped and median blade broader than lateral blades. So usually lies in orientation showing high birefringence.
Remarks:
Type species: Orthorhabdus serratus Bramlette and Wilcoxon, 1967
Original description:
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Neogene: Orthorhabdus; Orthorhabdus serratus
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