Census of Cnidaria (Medusozoa) and Ctenophora from South American marine waters OLIVEIRA, OTTO M. P. MIRANDA, THAÍS P. ARAUJO, ENILMA M. AYÓN, PATRICIA CEDEÑO-POSSO, CRISTINA M. CEPEDA-MERCADO, AMANCAY A. CÓRDOVA, PABLO CUNHA, AMANDA F. GENZANO, GABRIEL N. HADDAD, MARIA ANGÉLICA MIANZAN, HERMES W. MIGOTTO, ALVARO E. MIRANDA, LUCÍLIA S. MORANDINI, ANDRÉ C. NAGATA, RENATO M. NASCIMENTO, KARINE B. JÚNIOR, MIODELI NOGUEIRA PALMA, SERGIO QUIÑONES, JAVIER RODRIGUEZ, CAROLINA S. SCARABINO, FABRIZIO SCHIARITI, AGUSTÍN STAMPAR, SÉRGIO N. TRONOLONE, VALQUÍRIA B. MARQUES, ANTONIO C. Zootaxa 2016 2016-11-18 4194 1 1 256 6XRYC Ritchie, 1907b Ritchie 1907 [151,555,583,608] Hydrozoa Hebellidae Scandia Animalia Leptothecata 78 79 Cnidaria species mutabilis  Remarks: Migotto (1996), based on scarce and non-fertile material, remarked that his material was similar to those of Calder (1991:28), “especially with regard to their cylindrical shape”. Nevertheless, Migotto considered his identification provisional. Distribution in SouthAmerica: polyp—Pacific Ocean, Colombia, at 6.78°N 77.60°Win Octavia Bay, Ecuador, from 1.5°Nto 1.5°Sin GalápagosArchipelago, at 0.56°N 80.01°Win San Francisco Bay (Fraser 1938a, 1938b, 1939, 1948; Calder et al.2003); Atlantic Ocean, at Aruba Island, Brazil, at 9.80°S35°W, from 23.36°Sto 27.13°S(Leloup 1935; Migotto 1996; Migotto et al.2002; Shimabukuro 2007; Maronna et al.2008, abstract; Silveira & Morandini 2011;  Miranda et al. 2015). Habitat: polyp—from intertidal zone to 73mdepth, on hydroids (Fraser 1938a, 1938b; Migotto 1996; Calder et al.2003; Shimabukuro 2007).