Watznaueria sp. 1
Set number: 3202
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10µm
Watznaueria sp. 1
Coccolithites supracretaceus Reinhardt, 1965. Under the ICN, any species name originally published in association with a provisional genus is not validly published (ICN Art. 35.1) and therefore has no standing under the ICN.
Watznaueria supracretacea (Reinhardt 1965) Wise & Wind 1977, Invalid according to ICN Art. 35.1.
In plan view under cross-polarised light, the shields display white interference colours that decrease in intensity towards the periphery, where only the distal shield is present, and show parallel extinction lines and length-fast (–) elongation. The central area is not resolvable under cross-polarised light. The extinction angles are 0° in the shields.
Small- to medium-sized (3.0–7.0 µm), elliptical species of Watznaueria, characterised by a distal shield that is larger than the proximal shield and a narrow, indistinct central area. The central area and its features, consisting of two small depressions located at opposite ends along the long axis and connected by a suture, are only resolvable under phase-contrast illumination.
Watznaueria sp. differs from Watznaueria bayackii in its optical properties: Watznaueria sp. displays parallel extinction (0°), whereas Watznaueria bayackii exhibits inclined extinction with extinction angles of about 65–75°.
Watznaueria sp. is further distinguished from Watznaueria diaphanae by the nature of the central area. In Watznaueria sp., the central area is not resolvable under cross-polarised light, whereas in Watznaueria diaphanae the narrow, elongate central area is visible and exhibits dimmer interference colours than the shields.
Reinhardt, P. 1965. Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 7: 30-40.
Worsley, T. R., 1971. Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In: Farinacci, A. (ed.), Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome vol. 2, pp. 1301-1321.