I wrote: "..., but it would probably be best to say "the (Subgenus) elegans group of Caenorhabditis...." The parenthesis are necessary to show it is a subgenus." I forgot you said you didn't want to use subgeneric names. Then just write it like this. "The (elegans) group of Caenorhabditis..." This is per Article 6 on aggregates of species names. Ron Gatrelle