Hydaticus pacificus Aubé, 1838

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Hydaticus pacificus, from Thailand, Phetchabun. (Photo: František Slamka)


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Ordo: Coleoptera
Familia: Dytiscidae
Subfamilia: Dytiscinae
Tribus: Hydaticini
Genus: Hydaticus


Hydaticus pacificus pacificus (Aubé, 1838)

  • original combination: Hydaticus pacificus Aubé, 1838

Type locality

“Indonesia, Timor” (Aubé, 1838)

Type material

Holototype in Institut Royal des Sciences Naturelles de Belgique, Brussels, Belgium (Wewalka 2016).


India: Assam; Myanmar; Thailand; China: Yunnan; Cambodia; Laos; Vietnam; Malaysia: Malay Peninsula; Singapore; ? Philippines; Indonesia: Sumatra, Java, Karimunjawa Islands, Nias, Siberut, Enggano, Bali, Lombok, Sumbawa, Sumba, Timor, Romang, Tanimbar Islands, Obi, Kai Kecil (Wewalka 2016).

Records from Thailand

1 ex., “THAILAND: Chiang Mai Prov.: N-Thailand, Chiang Mai, Soppong – Pai, 1800 m, 1.–8.VI.1993, leg. P. Pacholátko & L. Dembicky” (NMW). 1 ex., “Phrae Prov.: N-Thailand, Wang Chin Res., 17°9320N 99°5610E, 160 m, leg. R. Ohnesorge” (CAS). 5 exs., “Tak Prov.: Sangkhlaburi, Thung Yai Naresuan N.P., pool in forest, 27.XII.1996, leg. P. Mazzoldi” (CGW, CPM, CSR); 4 exs., “Mae Ping, at light, 6.–10.IX.1991, leg. H. Malicky” (CGW, NMW). 1 ex., “Phitsanulok Prov.: Phu Hin Rongkla N.P., small stream near school of politics, 1250 m, 25.XII.1999, leg. P. Mazzoldi” (CPM); 3 exs., “Thung Salaeng Luang N.P., pools near river, 600–700 m, 4.I.1997, leg. P. Mazzoldi” (CGW, CPM, CSR). 1 ex., “Loei Prov.: Phu Kradung N.P., stream between Ano Dat pond and Tham Sor Noe waterfall, 1250 m, 28.XII.1999, leg. P. Mazzoldi” (CPM). 1 ex., “Kanchanaburi Prov.: Sai Yok N.P., pools on road, 23.VII.1996, leg. P. Mazzoldi” (CGW). 3 exs., “Phetchabun Prov.: Nam Nao N.P., pool of stream near park head quarter, 1100 m, 2.I.1997, leg. P. Mazzoldi” (CPM); 1 ex., “Nam Nao NP, 25.XI.1995, leg. H. Zettel (24)” (NMW); 1 ex., “Nakhon Nayok Prov. Khao Yai NP., 16.XI.1988, leg. M.A. Jäch (6)” (NMW). 1 ex., “Chanthaburi Prov.: Khao Sebap, XI.1981, leg. T. Lander” (NMB). 2 exs., “Trat Prov.: O-Thailand, Ko Chang, Than Mayom, 8.XII.1990, leg. M.A. Jäch (10)” (NMW); 1 ex., “O-Thailand, Ko Chang, Klong Prao, roadside ditch, 11.XII.1990, leg. M.A. Jäch (13-1)” (NMW). 1 ex: “Surat Thani Prov.: Koh Tao, 18.IX.1928, leg. H. Smith” (SIW); 1 ex., “Thailand, Phetchabun Province , near (just outside) Nam Nao National Park, Route 2216 then small road off, in village Khlong Choen, 16°40’29“N, 101°44’01“E, 21.03.2017, leg. H. Shaverdo” (NMW) [2017-Th-05A]; 5 exs., “THAILAND: Nakhon Nayok, 14°14'23"N 101°19'09"E, 1 km S Khlog Sisiat Reservoir 49 m, 10.8.2017, Atthakor & Hendrich leg. (THAI_LHWA_2017_05) (ZSM).


In Myanmar and Thailand, Hendrich and Shaverdo collected specimens in the shallow water at the margin of partly shaded ponds and puddles, without vegetation but with leaf litter, and in residual puddles of a small stream (30–40 cm wide) with a fine gravel bottom, and in small smelly dirty roadside puddles without vegetation but with decaying leaf litter and fig fruits. Mazzoldi found this species in Thailand in pools of streams, pools on a road, and pools near a stream. Zettel collected H. pacificus pacificus in Thailand in deep pools of an almost dry rivulet. Specimens in Sumatra were observed in a shaded waterhole in a swamp with cold water and thick leaf packs, in Lombok in pools in a stream bed, in Sumbawa in a pool of a rivulet and in Timor in a small pool near a water fall (Wewalka 2016). In Bali, it was often found in pools of intermittent streams (Suprayitno et al. 2017).



Original description

  • Aubé C. 1838b: Species général des hydrocanthares et gyriniens; pour faire suite au species général des coléoptères de la collection de M. le comte Dejean. Paris: Méquignon Père et Fils, xvi + 804 pp. [Published 29 September 1838.]

Other references

Wewalka G. 2016: Revision of the Hydaticus (Prodaticus) pacificus group of the Palearctic, Oriental and Australian Regions, and description of a new species of the H. (P.) bihamatus group (Coleoptera: Dytiscidae). Koleopterologische Rundschau 86: 9-45.

Online resources