Species: Hydrobasileus croceus (Brauer, 1867)
Synonyms: Hydrobasileus extraneus Kirby, 1893 [or Tramea externa Karsch, 1890]
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Odonata
   Family: Libellulidae
    Genus: Hydrobasileus

Morphology:
Larva:
 
- Body medium size
- Antenna 8 segments
- Head smooth, posterior of head straight
- Labium spoon shape, distal part of each palpal lobe with shallow indentation
- Labial palps with 9 palpal setae
- Premental setae 12 in each side of midline of mentum
- Wing-sheaths parallel
- Hind femur reaches to abdominal segment 7 and tibia with many rows of spines; fore and mid tibia with row of dent hairs


Figure
Hydrobasileus croceus, dorsal view of adult (Source: Vannachak, 2009)


Hydrobasileus croceus, A: dorsal view of larva; B: compound eyes; C: lateral spines on segmented 8 and 9 (Source: Vannachak, 2009)
Distribution:
 - Chiang Mai Province
 - Phrae Province
 - Kanchanaburi Province
 - Sakon Nakhon Province
 - Chaiyaphum Province
 - Nakhon Pathom Province
 - Nakhon Nayok Province
 - Chachoengsao Province
 - Chon Buri Province
 - Ranong Province
 - Chumphon Province
 - Krabi Province
 - Songkhla Province
 - 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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