Sycon asperum n. sp. Schmidt, 1862: 15, pl. I fig. 4; Burton, 1931: 167.
Sycinula aspera : Schmidt, 1868: 35 (footnote)
Leucandra aspera : Hanitsch, 1895: 206.
Leuconia aspera : Burton, 1963: 493, figs. 308-309; Van Soest and Weinberg, 1980: 3, fig. 3; Van Soest et al., 1981: 38.
Vosmaer (1884) and Burton (1963) gave a wide interpretation to this species. Their conclusions need to be evaluated.