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Calcidiscus leptoporus

Mon, 21/04/2008 - 14:39 — Jeremy Young
Citation: 
Calcidiscus leptoporus (Murray and Blackman, 1898) Loeblich and Tappan, 1978 [Coccosphaera]

Description: Species of Calcidiscus producing circular to sub-circular coccoliths with, closed central-area.

Remarks: This is something of a default name appied to a wide range of morphotypes but in most assemblages there is clearly a separation between slightly sub-cicular forms with a closed central area (leptoporus) and circular froms with an open central area (tropicus).

Range: NN2 to 21.

4-13leptoporus.JPG 4-12leptoporus.JPG 4-11leptoporus.JPGCalcidiscusC.JPG

Clept191-03NN16.JPGClept175-28NN21.JPG182-07.jpgCalcidiscusA.JPGCalcidiscusB.JPG

Variants:

C. fuscus (Backman, 1980) Janin, 1987 - small , broadly elliptical;

C. pataecus (Gartner, 1967) de Kaenel and Villa, 1996 - small , broadly elliptical.

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