I doubt that Pista unibranchia can be interpreted as non-indigenous species. To my mind it is quite indigenous
wormly
Igor
--
Dr. Sc. Igor A. Jirkov
Leading Scientific Fellow
Department of Hydrobiology
Biological faculty
Moscow State University
Moscow
Russia
http://hydro.bio.msu.ru/index.php?option=com_content&view=article&id=92&Itemid=95
