In 2000 , the ICZN agreed and voted to retain the historical taxonomic arrangement of subspecies within this evolutionary lineage .
Barry petitioned the International Commission on Zoological Nomenclature ( ICZN ) to suppress the changes proposed in 1996 to merge two of these species .
In 2000 , the ICZN agreed and voted to retain the historical taxonomic arrangement of subspecies within this evolutionary lineage .
Barry petitioned the International Commission on Zoological Nomenclature ( ICZN ) to suppress the changes proposed in 1996 to merge two of these species .