conducted by the Periyar Tiger Conservation Foundation, Indian Dragonfly Society and the Forest and Wildlife Department in October 2017 found 77 species of odonata including Asian emerald (Hemicordulia asiatica). A survey jointly conducted by the same team in September 2018 found eight more new species. Timeline 1895 – Construction of the Mullaperiyar Dam 1899 – Formation of the Periyar Lake Reserve 1933 – S.C.H. Robinson made the first game warden 1934 – Formation of Nellikkampatty Game Sanctuary 1950 – Consolidation of Periyar as a wildlife sanctuary 1978 – Declaration of Periyar as a tiger reserve 1982 – Preliminary notification of the core area as a national park 1991 – Brought under Project Elephant 1996 – India Eco-development Project launched 2001 – Divided into Periyar East and Periyar West 2004 – Formation of Periyar Foundation 2007 – 148 km2 of the Goodrical Range added to the reserve 2011 – The management of Periyar Tiger Reserve has been assessed as "very good" by the National Tiger Conservation Authority and the Union Ministry of Environment and Forests. 2012 - An additional 148 km2 of evergreen forest at Ponnambalamedu added to the reserve Ecosystem valuation It is estimated that the Periyar Tiger Reserve (PTR) provides flow benefits worth 17.6 billion rupees (1.9 lakh (190,000)/ hectare) annually. Important ecosystem services included gene-pool protection (7.86 billion), water provisioning to districts of Tamil Nadu (4.05 billion), habitat and refugia for wildlife (3.55 billion), employment generation for local communities (25 million), water purification services to nearby towns and districts (483 million) and recreation value (425 million). Gallery See also Karimpuzha Wildlife Sanctuary List of birds of South India Ranni Forest Division Films Life for Lives References External links Online Booking for Periyar Tiger Conservation Foundation Tiger reserves of India Protected areas of Kerala Periyar (river) Protected areas established in 1982 South Western Ghats moist deciduous forests South Western Ghats montane rain forests 1982 establishments in Kerala Geography of Idukki district Tourist attractions in Idukki district Geography of Kottayam district Geography of Pathanamthitta district Tourist attractions in Pathanamthitta district Tourist attractions in Kottayam district Elephant reserves of India National parks in Kerala Pamba River