Submitter has sample
One New Zealand mud snail (Potamopyrgus antipodarum). I've sampled at this site in the past (2006), and re-sampled July 12th, 2012. This time I found 1 New Zealand mud snail in the sandy substrate along the edge of the shore downstream of the boat ramp. The density appeared to be very low, but I collected quantitative samples and will have a better idea of the density once samples are sorted. As far as I know, this is the first time NZMS have been found in the Siuslaw.