Species: Dineutus spinosus Fabricius, 1781
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Coleoptera
   Family: Gyrinidae
    Genus: Dineutus

Morphology:
Adult:
 - Dineutus spinosus can be distinguished from other Thai Dineutus by margin of the pronotum is lightly colored, and elytron and by the spinose elytral apex having both parasutural and epipleural spines developed (Suksai et al., 2021).


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


Habitat: - D. spinosus occurs on exposed rivers, streams, ponds, and water tanks.

Distribution:
 - Amnat Charoen Province: Kork Stream, Chanuman District.
- Kalasin Province: Phu Pan National. Park.
- Mukdahan Province: Huai Lao Waterfall, Khamcha-I District.
- Mukdahan Province: Tadton Waterfall, Nong Sung District.
- Nakhon Ratchasima Province: Sakaerat Environmental Research Station.
- Nakhon Ratchasima Province: Thap Lan Natl. Park.
- Nakhon Si Thammarat Province: Chulabhorn District.
- Sisaket Province: Huay Sala Wildlife Sanctuary, Sum Sai Waterfall.
- Songkhla Province: Prince of Songkla University.
- Surat Thani Province: Ban Na Doem District.
- Ubon Ratchathani Province: Huay Sae Stream, Khong Chiam District.

Work cited:
 - Sites, R.W. and Vitheepradit, A. 2010. Recovery of the freshwater lentic insect fauna in Thailand following the tsunami of 2004. The Raffles Bulletin of Zoology 58(2): 329–348.
 - 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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