Species: Patrus phetchabunensis (Suksai et al., 2021)
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Coleoptera
   Family: Gyrinidae
    Genus: Patrus
Collection specimen
Holotype:
 - Male: Enns Entomology Museum, University of Missouri, Columbia, Missouri, USA.
Paratype:
     - 163 male and female examples: Aquatic Insect Collection, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand; Thailand Natural History Museum, Pathum Thani, Thailand; Enns Entomology Museum, University of Missouri, Columbia, Missouri, USA.

Morphology:
Adult:
 - Patrus phetchabunensis is most similar to P. salvazai but can be distinguished by P. phetchabuensis has the protibial constriction limited to the basal 2/5, the shape of the cordiform glabrous region in males is relatively wider anteriorly near the humeral region than that of P. salvazai, and the aedeagus with median lobe evenly tapered. Females of both species can be distinguished by P. phetchabunensis has the elytral apex obliquely truncated rather than rounded as P. salvazai.


Figure


Distribution:
 - Loei Province: Phu Kradueng National Park.
- Loei Province: Phu Rua National Park.
- Phitsanulok Province: Phu Hin Rongkla National Park.
- Nan Province: Doi Phu Ka National Park.

Work cited:
 - Suksai, B., Gustafson, G.T., Sites, R.W. and Sangpradub, N. 2021. Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae). Zootaxa 4991(3): 561–591.

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