Candidatus

Etymology
From.

Proper noun

 * 1)  A taxonomic name component, usually forming an extended genus or species name, used as an interim status for a bacterium not yet cultured in a laboratory.

Usage notes

 * When used as part of the name for a candidate genus or species, it should appear in italics and the following elements in ordinary Roman type, for example "".
 * It is written Ca. when abbreviated.