Habitat: larvae of O. duaricus occur in headwater streams, where they were found in the sandy gravel substrate (Boonsoong and Chainthong, 2016).
Distribution: - Ratchaburi Province - Kanchanaburi Province
Work cited: - Boonsoong, B. and Chainthong, D. 2016. Description of two final stadium Onychogomphus larvae from Thailand (Odonata: Gomphidae). Zootaxa 4066 (5): 561-570.
