1. Acevedo M, Straehler-Pohl I, Morandini A, Stampar S, Bentlage B, Matsumoto GI, Yanagihara A, Toshino S, Fuentes V (2019) see Part 1
2. Adler L (2008) see Part 1
3. Adler L, Jarms G (2009) see Part 1
4. Agassiz L (1862) Contributions to the natural history of the United States of America. IV. Second monograph in five parts, Acalephs in general, Ctenophorae, Discophorae, Hydroidae, homologies of the Radiata. Little, Brown & Company, Boston, 380 pp.
5. Arai M (1997) see Part 1