Scheldt species source details
Tanaka, O. (1957). Notes on Calanus helgolandicus and Calanus plumchrus. Information Bulletin on Planktology in Japan 4:9-10.
116442
Tanaka, O.
1957
Notes on Calanus helgolandicus and Calanus plumchrus.
Information Bulletin on Planktology in Japan
4:9-10.
Publication
Available in Wilson Copepod Library (non-digital)
Available for editors 
Calanus helgolandicus (Claus, 1863) represented as Calanus helgolandicus helgolandicus (Claus, 1863) (additional source)