Klebsormidiales
Encyclopedia
The Klebsormidiaceae are a family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 containing three genera of charophyte green alga forming multicellular, non-branching filaments. A fourth genus Chlorokybus is sometimes included as well, but this problematic and poorly known genus is sometimes placed in a separate class Chlorokybophyceae.

The genera Koliella
Koliella
In taxonomy, Koliella is a genus of algae, specifically of the Microthamniales.-Scientific databases:* * *...

and Raphidonema
Raphidonema
Raphidonema is a genus of filamentous green alga comprising five species. It is a member of the Trebouxiophyceae....

were formerly classified as close relatives of Klebsormidium, based on similarities in cell division. However, analysis of both nuclear and chloroplast DNA shows that both of these genera belong to the class Trebouxiophyceae
Trebouxiophyceae
In taxonomy, the Trebouxiophyceae are a class of green algae, in the division Chlorophyta.-Links to scientific databases:...

and are not charophytes.
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