Species: Vestalis gracilis (Rambur, 1842)
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Odonata
   Family: Calopterygidae
    Genus: Vestalis

Morphology:
Larva:
 
- Body elongate
- Antenna segment 1 greatly elongate and longer than the combined length of remaining segments
- Head flat
- Labium quadrate or more or less triangular in shape with long moveable hooks
- Prementum with deep median cleft with 2 premental setae on each side
- Caudal gills long and usually blade-like with distinct dorsal ridge
- Legs long and slender especially tibia


Figure
Vestalis gracilis, lateral view of adult (Source: Vannachak, 2009)


Vestalis gracilis, A: dorsal view of larva; B: dorsal view of head; C: labium (Source: Vannachak, 2009)
Distribution:
 - northen Thailand
 - northeastern Thailand
 - eastern Thailand
 - southwestern Thailand
 - central Thailand
 - southeastern Thailand
 - southern Thailand
 - Khon Kaen Province

Work cited:
 - Hämäläinen, M. and Pinratana, A. 1999. Atlas of the Dragonflies of Thailand: Distribution Maps by Provinces. Brothers of St. Gabriel in Thailand, Bangkok.
 - Vannachak, V. 2009. Association of Odonnata nymphs and adults in Muang district, Khon Kaen Province. Special study. Khon Kaen University.

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