Zootaxa is ranked among top 5 in Zoology based on Eigenfactor
Eigenfactor ranks journals based on their overall importance, not just average citations in the current year to papers of preceeding two years (i.e. impact factor).
Zootaxa is ranked among top 5 in Zoology.
http://www.eigenfactor.org/rankings.php?bsearch=ZM&searchby=category&orderby=Eigenfactor