&lt;span lang="EN-US"&gt;&lt;span style="font-family: 'Times New Roman'; font-size: small;"&gt;&lt;strong&gt;Order Opiliones Sundevall, 1833. &lt;em&gt;In&lt;/em&gt;: Zhang, Z.-Q. (Ed.) Animal Biodiversity: An Outline of Higher-level Classification and Survey of Taxonomic Richness (Addenda 2013) &lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;
Journal: Zootaxa
Year: 2013

The taxonomy of harvestmen is progressing at a fast pace. Many of the figures given in the previous outline Kury (2011) have changed in this short space of two years. The total number of valid species grows slowly because the new synonymies from revisions almost cancel out the new descriptions. The total of 6484 extant species of Opiliones (Kury 2011) has increased to 6534, or less than 1%.