List of the studied authors
Sars, 1909 (p.6, Descr.F, figs.F); Sars, 1938 (p.38, Fig.F); Boxshall, 1979 (p.244, figs.F,M); Huys & Boxshall, 1991 (p.266, 443, figs.); Boxshall & Halsey, 2004 (p.786: figs.F); Vives & Shmeleva, 2010 (p.400, figs.F,M,
Rem.); Laakmann & al., 2019 (p.330, fig. 2, 3, phylogenetic relationships)