Lagena Species Foraminifera : 2013

Photograph by

Spike Walker ASIS FRPS

About this image

Light micrograph of a foraminiferan of the genus Lagena. The foraminiferans are a class of marine protists that have an external shell, or ‘test’. Most commonly these are made of calcium carbonate. When the organism dies, these tests sink to the sea bed and over geological time form the bulk of carbonate rocks such as chalk and limestone. About 270,000 species, living and in the fossil record, have been described. Individuals of Lagena are typically around 0.4mm long. This image was made using ‘Spikeberg’ illumination, a combination of polarised light and Rheinberg illumination pioneered by the photographer, and captured on a Canon EOS 5D Mark II camera. The extended depth of field was achieved using stacking software to combine 54 individual frames focused at intervals of 4 micrometres. Penkridge, Staffordshire, United Kingdom

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