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Odonata fauna of Diomabok Lake and its surroundings, Davao Oriental, Mindanao Island, Philippines
(2011)
During three visits in October and December 2010 and May 2011, a total of 56 Odonata species was recorded. All species reported here represent first Odonata records in the area. The most noteworthy discoveries were one novelty (Hydrobasileus vittatus) to the Philippine fauna and two first records (Tetracanthagyna brunnea and Aethriamanta gracilis) from Mindanao Island. Seven species represent either new species to science or potentially new species; one Drepanosticta and one Amphicnemis are new to science, and another Drepanosticta, Amphicnemis, Pseudagrion, Gomphidia and Urothemis are potentially new to science.
Odonata were recorded and voucher specimens were collected between August 3- 13 and August 16-20, 2011. This account lists 51 species of Odonata for both islands, 47 species in Siargao and 24 species in Bucas Grande. Thirty seven species are new island records for Siargao Island while the 24 species recorded in Bucas Grande represent the first island records. Three species are new to science, and two of which (Drepanosticta schorri n. sp., Pseudagrion schieli n. sp.) are described in the present paper. Four species previously listed (Hämäläinen & Müller, 1997) remained elusive during the present survey.