Cretarhabdus conicus
SEM photo of Cretarhabdus conicus from Mutterlosa, 1992b (Pl. 3, Fig. 2)
Set number: 3023
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Set number: 3022
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Set number: 3021
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Set number: 3019
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Set number: 3020
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Cretarhabdus conicus Bramlette & Martini, 1964
The holotype is preserved in side view, whereas the isotype is in plan view and clearly shows the arm tips of the axial cross overlapping the pelaga.
Optical properties consistent with those of Cretarhabdus.
Species of Cretarhabdus are constructed of cretarhabdid pelaga sloping towards a distally arched central area, which is spanned by an axial cross whose arm tips overlap the pelaga, supporting a distal process, a characteristic feature of Cretarhabdus conicus. The inter-cross area is occupied by lateral bars that delimit pores arranged in two or more complete concentric cycles. The number of pores in the outer cycle is typically 16 or more.
Bramlette, M. N. & Martini, E. 1964. The great change in calcareous nannoplankton fossils between the Maastrichtian and Danian. Micropaleontology. 10(2): 291-322.
Mutterlose, J., 1992b. Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results 123, 343-368.
Holotype
Cretarhabdus conicus
Bramlette & Martini, 1964
Late Maastrichtian
Arkadelphia Clay, USGS locality 16991, Alabama, USA