Planche 1 Issued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.391, Fig.278].
Female (from central part Arctic ): habitus (dorsal and left lateral side); urosome (lateral right side); mx1; MLe, Md (left side); GLa, forehead (lateral); S1, P1; S5, P5.

Planche 2 issued from : O. Tanaka & M. Omori in Publ. Seto Mar. Biol. Lab., 1971, XIX, 4. [p.265, Fig.7].
Female (from Izu Region): a, c, forehead (dorsal and lateral, respectively); b, d, last thoracic segment and urosome (dorsal and lateral , respectively); e, A2; f, Md; g, Mx1; h, Mx2; i, Mxp; j, P1; k, P5.

Planche 3 issued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2318, Fig.11, A-J];
Female (from 53°12'N, 162°03'W): A-B, habitus (lateral and dorsal, respectively); C, forehead (lateral); D, genital segment (lateral); E, Md; F, Md (cutting edge of gnathobase ); G, same (oblique view); H, Mx1; I, P1 (anterior); J, left P5 (anterior).