Species: Dineutus sitesi Gustafson, Hájek & Miller, 2016
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Coleoptera
   Family: Gyrinidae
    Genus: Dineutus
Collection specimen
Holotype:
 - 1 Male: Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM, U.S.A. (K. B. Miller)
Paratype:
     - 7 examples: Enns Entomology Museum, University of Missouri, Columbia, Missouri, U.S.A (R. Sites), 4 examples: National Museum of Natural History, Washington D.C., U.S.A (C. Micheli), 2 examples: Natural History Museum, National Science Museum, Ministry of Science and Technology, Pathum Thani, Thailand, 1 example: Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM, U.S.A. (K.

Morphology:
Adult:
 - Dineutus sitesi can be distinguished from all other Thai Dineutus by the broadly oval body form, large size (male: 15.0–17.0 mm; female: 13.4–15.7 mm), rounded elytral apex lacking spines and serrations, and profemur of male with sub-apicoventral tooth (Suksai et al., 2021).


Figure
Dorsal habitus of Dineutus sitesi male (Photo: Benjamart Suksai).


Habitat: - D. sitesi was found in streams and pools beneath waterfalls.

Distribution:
 - Phitsanulok Province: Phu Hin Rong Kla National Park
 - Kanchanaburi Province: Thong Pha Phum National Park.
- Phitsanulok Province: Thung Salaeng Luang National Park.

Work cited:
 - Gustafson, G.T., Hájek, J. and Miller, K.B. 2016. Description of two new species of Dineutus sensu stricto from Southeast Asia (Coleoptera: Gyrinidae) with a key to the known species of the subgenus. Acta Entomologica Musei Nationalis Pragae 56(2): 629–643.
 - Suksai, B., Gustafson, G.T., Sites, R.W. and Sangpradub, N. 2021. The Gyrinidae (Coleoptera) fauna of Thailand: Key to tribes and genera, with new records and keys to species of Dineutini and Gyrinini. Zootaxa 5071(1): 097–117.

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