Pontosphaera vigintiforata
Set number: 1897
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10µm
Discolithus vigintiforatus Kamptner, 1948
Pontosphaera vigintiforata (Kamptner, 1948) Proto-Decima et al., 1978, p. 573 [invalid combination according to ICN Art. 41.5]
A species of Pontosphaera exhibits uniform interference colours in the plan view in XPL, resulting from the similar height of the wall and distal cover over the proximal plate. Pontosphaera vigintiforata features a proximal plate with pores arranged in two complete concentric cycles, with additional randomly arranged pores in the centre. The species displays first-order white interference colours, laevogyre-inclined extinction lines with a typical extinction angle of about 68° on the distal side, and length-fast (−) elongation.
Kamptner, E. 1948. Coccolithen aus dem Torton des Inneralpinen Wiener Beckens. Anzeiger der Österreichische Akademie der Wissenschaften, Mathematische-Naturwissenschafliche Klasse, Wien. 157: 1-16.
Loeblich, A. R. & Tappan, H. 1966. Annotated index and bibliography of the calcareous nannoplankton. Phycologia. 5: 81-216.
Varol, O. 1989a. Calcareous nannofossil study of the central and western Solomon Islands. In: Vedder, J.G. & Bruns, T.R., (Eds.), Geology and offshore resources of Pacific island arc-Solomon Islands and Bougainville, Papua New Guinea Regions: Houston, Texas, Circum-Pacific Council for Energy and Mineral Resources Earth Sciences Series. 12: 239-268.
Holotype
Discolithus vigintiforatus
Miocene
Inner alpine Vienna basin