Taxonomy used when analyzing USGS NAWQA samples starting in January 2006. Also used for other Phycology projects. This taxonomic system updated the NAWQA 2001-Start system and is documented in the "Fifteenth NAWQA Workshop on Harmonization of Algal Taxonomy - April 28 - May 1, 2005", Patrick Center Report number 06-07, published August 2006. Any new taxa added to this system, while it is still active, should also be added to the ANSP -2007 system (number 21). [only in 2007? what about 2008 ...