Probably the world's largest spider, Heteropoda maxima
(above), has a colossal legspan of up to 12 inches (30 centimeters), according to a December 2008 WWF report.
The giant, discovered in a large cave in northern Laos in 2001, joins a diverse collection of more than a thousand new species found in the Greater Mekong region in the past ten years.
"Some of these species really have no business being recently discovered," WWF's Chapman said.
To conserve the newfound species, the Mekong region's six governments "need to work together and formalize a treaty which ensures that good environmental management is at the center of any development planning," Chapman added.
"And this needs to happen soon."
Photograph courtesy Greater Mekong Programme/WWF International