The Clogmia page says there's
probably only one species in North America, C. albipunctata.
Is it that we're not sure whether the literature treats Clogmia in N. America as a single species or multiple species? Or is it merely that, although it may be treated as multiple species in the literature, we're not sure if that treatment is correct?
If my question isn't clear, let me know.
The page is
here.