First record of the groove-toothed bat (<i>Phoniscus jagorii</i>, Vespertilio-nidae) in the south of Vietnam
The genus Phoniscus is one of the least studied bat genera, known from Indochina by very few records. It was recorded in Vietnam only once, in Phu Tho Province. In May 2011, in about two hours after sunset, an adult female of the groove-toothed bat was netted in Southern Vietnam, in Nam Cat Tien National park. The bat was captured near the small pool used as water source by different animals, situated in the open place surrounded with low seasonally flooded forest, secondary growth of bushes and vines and area covered with the "elephant grass". Nearest distance from the mist net to edge of the tall primary forest was about 40 m. The captured bat was easily identified by its proportionally very large upper canines, well seen when animal showed teeth. These canines, in contrast to those of Kerivoula and Murina, are compressed laterally, have elongated base and groove on the lateral surface. Forearm length of the captured individual was 36.6 mm, which marks it as P. jagorii, the larger of the two the most widespread members of Phoniscus. The bat was captured in association with further species: Hipposideros grandis, H. pomona, Murina walstoni, Myotis ater, Hypsugo cadornae and Hesperoptenus blanfordi, amongst which records of M. walstoni and H. cadornae are also new for Cat Tien. Taking into account that Cat Tien was visited by many investigators (including bat specialists), it looks surprising to find so many species new to the park in the same day and in the same place. It is obvious, that mentioned species have different ecological preferences and the habitat described above is scarcely suitable for most of them. All this supports a high role of permanent water sources for bats, inhabiting tropical forest with seasonal climate, on the one hand, and, on the other hand, importance of such places for faunal studies since they give possibility to reveal rare faunal elements during even short survey.