What is "subcastes"

Usage examples of "subcastes".

The carders and the dyers, incidentally, are subcastes separate from the weavers.

All are subcastes of the rug makers, which, itself, interestingly, perhaps surprisingly, is accounted generally as a subcaste of the cloth workers.

They were definitely getting close—the kids tear-assing around had the high noses and elongated skulls that set Fourth Meander folk apart from the less prestigious subcastes who cultivated the left bank of the Third Part.