- Belgium
- Muys, 2013
- Denmark
- Blakemore, 2007
- France
- Bouche, 1972; Qiu and Bouche, 1998n
- Germany
- Lehmitz et al., 2014
- Ireland
- Blakemore, 2008
- Norway
- Blakemore, 2007
- Spain
- Diaz Cosin et al., 1992; Monroy et al., 2003; S. m. hispanicus: Qiu and Bouche, 1998n
- Switzerland
- Amone III and Zaller, 2014
- United Kingdom
- Sims and Gerard, 1999; Scotland: Carpenter, 2011
- United States
- New Jersey: Reynolds, 1995; Reynolds and Wetzel, 2004, 2008
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Data are not exhaustive. The database is permanently a work in progress.