This 2008 photo released by The World Wide Fund for Nature (WWF) shows a tiger-striped pitviper or Cryptelytrops honsonensis, in Hon Son Island in Rach Gia Bay in the Kien Giang Province of southern Vietnam. The reptile was among 163 new species discovered last year in Greater Mekong region, a biologically rich region that stretches over five countries and borders the mighty Mekong River, an environmental group said Friday, Sept. 25, 2009.