Foraminifera
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Foraminifera are single-celled organisms, members of a phylum or class of Rhizarian protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly an external sh
Fossil nummulitid foraminiferans showing microspheric (larger) and megalospheric individuals (smaller); Eocene of the United Arab Emirates; scale in mm
Foraminiferan tests (ventral view)
The mysterious Paleodictyon has been interpreted as a fossil xenophyophore but this remains controversial.
Microfossil
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A microfossil is a fossil that is generally between one micrometre and one millimetre in size, the visual study of which requires the use of light or electron microscopy. A fossil which can be studied
An enigmatic carbonaceous microfossil, Cochleatina canilovica, from the Late Ediacaran
Microfossils from a deep sea sediment core
A Late Silurian chitinozoan from the Burgsvik beds showing its flask shape
Acritarch from the Weng'an biota c. 570–609 mya