Is there an option to find the list/format of names for supported groups for ncbi-genome-download?

[Anju-h]

Hi,
I have been trying to download genomes using command for eg. "ncbi-genome-download --refseq-categories reference platyhelminthes", but I keep getting the error Unsupported group: platyhelminthes. I have tried different combinations of options as well.
I was wondering is there a list or an option to see the supported format (or a name list) for a groups I wish to download genomes from ncbi.