Prediscosphaera spinosa
Set number: 3251
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10µm
Set number: 3286
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10µm
Set number: 3292
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10µm
Set number: 3302
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10µm
Set number: 3308
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Set number: 3303
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Deflandrius spinosus Bramlette & Martini, 1964
Prediscosphaera decorata Vekshina, 1959, was not validly published under ICN Art. 9.1 because the designated holotype consists of more than one specimen rather than a single individual.
Prediscosphaera spinosa: Circular basal placolith larger than 5.0 μm, bearing a long, smooth distal process terminating in blades that form acute angles with the stem.
Prediscosphaera columnata: Circular basal placolith larger than 5.0 μm, bearing a distal process consisting of a two-tiered stem with nodose junctions, terminating in blades oriented perpendicular to the stem.
Deflandrius columnatus Stover, 1966
Prediscosphaera columnata (Stover, 1966) Perch-Nielsen, 1984
Based on measurements from the holotype illustrations, the diameters of the basal placoliths are estimated to be approximately 7.0 μm in Prediscosphaera spinosa and 6.4 μm in Prediscosphaera columnata.
Bramlette, M. N. & Martini, E. 1964. The great change in calcareous nannoplankton fossils between the Maastrichtian and Danian. Micropaleontology. 10(2): 291-322.
Gartner, S., 1968. Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles 48 (Protista 1), 1-56.
Holotype
Deflandrius spinosus
Late Maastrichtian
Arkadelphia Clay, USGS locality 16991, Alabama, USA