List of the studied authors
Heron & Damkaer, 1969 (p.9, Descr.F, figs.F); Heron & Damkaer, 1978 (p.13, figs.F,M); Gardner & Szabo, 1982 (p.128, figs.F,M); Razouls, 1994 (p.192, figs.F,M); Huys & Böttger-Schnack, 1996/97 (p.248, figs.F,M); Boxshall & Halsey, 2004 (p.577, p.576: fig.M)