The Fish and Wildlife Service (Service) announced (pdf) that it has re-opened the comment period on its August 18, 2009 proposed designation of critical habitat for the Sonoma County Distinct Population Segment of the California tiger salamander (Ambystoma californiense) under the Endangered Species Act.  The Service is reopening the comment period to allow interested parties an opportunity to comment on the proposed addition of 4,945 acres of critical habitat for the Santa Rosa Plain Unit as described in the January 18, 2011 notice (pdf).  In total, the Service is proposing to designate approximately 55,800 acres of land as critical habitat for the species.  The deadline to submit comments is 11:00 pm Eastern Time on July 5, 2011.