Hydrophilus olivaceus Fabricius, 1781

Hydrophilus olivaceus Fabricius, 1781: 289; Satô 1972b: 51; Roy 1982: 57; Hansen 1999a: 231; Biswas & Mukhopadhyay 1995: 160; Jafri et al. 1998: 195–201; Mukhopadhyay et al. 2000: 90; Hebauer 2002a: 27; Mukhopadhyay & Ghosh 2003: 16; Mukhopadhyay & Sengupta 2004: 455; Mukhopadhyay 2007: 412; Chandra 2008: 171; Thakare & Zade 2011: 67; Sharma & Bano 2012: 500; Ghosh & Mandal 2013: 94; Ghosh et al. 2014: 108; Jaiswal et al. 2014: 96; Fikáček et al. 2015c: 51; Mukhopadhyay 2015: 392; Devi et al. 2017: 9; Saroj 2017: 48; Ghosh et al. 2018b: 28; Ghosh et al. 2020: 231; Ghosh et al. 2021: 616; Anamika et al. 2021: 185; Chakradhari & Tiwari 2022: 15; Ghosh 2022: 492; Przewoźny 2022: 20; Deb et al. 2023: 24047; Shankar et al. 2024: 462; Sheth et al. 2024: 24862.

Stethoxus (Stethoxus) olivaceus: Régimbart 1902a: 200, pl. 7, fig., 10.

Hydrous oblongus Olivier, 1793: 125 .

Type locality: India, Tamil Nadu (or Andhra Pradesh), Coromandel Coast (Hansen 1999a).

Distribution in India: Andhra Pradesh, Bihar (Bhagalpur), Chhattisgarh (Rajgarh), Goa, Haryana (Kalesar Wildlife Sanctuary), Himachal Pradesh (Chamba, Sardhkhand, Kangra, Dharamshala, Nagini), Jharkhand (Ranchi: Tetara), Karnataka (Bengaluru), Madhya Pradesh (Jabalpur), Maharashtra ( Melghat Tiger Reserve, Pune, Sangli, Nashik, Pune, Raigad), Manipur (Ukhrul), Meghalaya ( East Garo Hills), Odisha (Balasore, Satkosia and Basipally Wildlife Sanctuary), Rajasthan (Jodhpur, Kailana Lake), Tamil Nadu, Telangana (Hyderabad, Nalgonda), Uttarakhand (Asan Wetland), Uttar Pradesh (Agra, Sultanpur), and West Bengal (Birbhum, East Midnapore).

Global distribution: China, India, Nepal, Malaysia, Myanmar, Thailand, and Vietnam.