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additional sourceSchuchert, P. (2007). The European athecate hydroids and their medusae (Hydrozoa, Cnidaria): Filifera part 2. <em>Revue suisse de Zoologie.</em> 114: 195-396., available online athttps://www.biodiversitylibrary.org/page/41281106 page(s): 367 [details]