- Algeria
- Gagneur et al., 1986; Lounaci, 1987
- Argentina
- Christoffersen, 2007
- Belgium
- Van Beneden, 1895
- Bulgaria
- Atanackovic et al., 2013
- China
- Guangdong: Wang H.Z. and Cui, 2007; Hunan: Wang H.Z. and Cui, 2007; Jiangxi: Wang H.Z. and Cui, 2007; Xinjiang: Wang H.Z. and Cui, 2007
- Croatia
- Atanackovic et al., 2013
- Czech Republic
- Schenkova and Kroca, 2007
- France
- Moniez, 1889; Bouche, 1972; Giani, 1976
- Germany
- Stein H. et al., 2012; GBIF
- Hungary
- Smith M.E. et al., 1997; Atanackovic et al., 2013
- Italy
- Dedieu, 1999; Lencioni, 2004
- Japan
- Ohtaka, 2014
- Montenegro
- Jablonska and Pesic, 2011; Sundic et al., 2011
- Morocco
- Baroudi, 1985, 1987; Idbennacer, 1990; Yacoubi-Khebiza, 1990, 1996
- Romania
- Atanackovic et al., 2013
- Serbia
- Jakovcev-Todorovic et al., 2006; Atanackovic et al., 2013
- Slovakia
- Atanackovic et al., 2013
- Spain
- Rodriguez P., 1986
- The Netherlands
- Veen, 2013
- Tunisia
- Boumaiza et al., 1986, 1986b
- United States
- Syn. H. ichthyophagous: California: Gates, 1971c
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Data are not exhaustive. The database is permanently a work in progress.