http://www.nies.go.jp/biodiversity/inva ... 0100e.html
indicates accidental introduction with fishery products as a source for their introduction in other places.
I'm about to start looking at some vertebrate museums for evidence of where they might be in California. I'm curious.
Nothing found in MVZ under Glandirana rugosa or Rana rugosa. Latter they had for Hawaii.
Mothing found in CAS for CA or HI for either.
I didn't find anything at herpnet2 but their search is broken. Searching w/o specified location brings up bunch or results for Japan and pages more, too many to look through. Specifying a country, even Japan, brings no results. They need to fix their code.