- Algeria
- Omodeo et al., 2003
- Austria
- Christian and Zicsi, 1999; Szederjesi et al., 2014
- Denmark
- BOLD; Blakemore, 2007
- France
- Bouche, 1972
- Georgia
- Kvavadze, 2000
- Germany
- BOLD; Szederjesi et al., 2014
- Hungary
- Szederjesi et al., 2014
- Ireland
- All data concern sub-species:
- H.o.oculatus: Blakemore, 2008
- Italy
- Paoletti et al., 2013
- Moldova
- Fedorovich, 1991
- Portugal
- Trigo et al., 1998
- Qatar
- Al Yousuf, 1986
- Russia
- Perel, 1979; Perel-Vsevolodova, 1997; Blakemore, 2007c
- Slovenia
- Mrsic, 1992; Szederjesi et al., 2014
- Sweden
- BOLD
- Switzerland
- Glasstetter, 2012
- Turkey
- Omodeo and Rota, 1989
- United Kingdom
- Sims and Gerard, 1999
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Data are not exhaustive. The database is permanently a work in progress.