Canthocamptus nordenskioldii Lilljeborg, 1902: 1, pl. 3, figs 1–6 (original description). Canthocamptus gibba Okuneva, 1983: 1343, fig. 1, syn. nov.
The synonymy of C. gibba and A. nordenskioldii described from Baikal is confirmed by a comparison of Okuneva’s drawings (1983) with specimens of A. nordenskioldii from the Lena Delta and the original description. In particular, the shape of the caudal rami and their setae are completely identical (characters 73, 77). Canthocamptus gibba, like other species of the genus Attheyella, has a 1-segmented eXopod of antenna (character 8) and only five setae on the male P5 eXopod (character 58).