Rotaliida
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The Rotaliida are an order of Foraminifera, characterized by multilocular tests composed of bilamellar perforate hyaline lamellar calcite that may be optically radial or granular.
Ammonia beccarii
Baculogypsina sphaerulata (Calcarinidae)
Miniacina miniacea (Homotrematidae)
Heterostegina depressa (Nummulitidae)
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
Rotaliida
…The Rotaliida are an order of Foraminifera, characterized by multilocular tests (shells) composed of bilamellar perforate hyaline lamellar calcite that may be optically radial or granular. In…
Ammonia tepida
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.