Stylasterids (Hydrozoa: Stylasteridae) from Mar del Plata submarine canyon and adjacent area (southwestern Atlantic), with a key to the species off Argentina Bernal, M. C. Cairns, S. D. Penchaszadeh, P. E. Lauretta, D. Zootaxa 2021 2021-05-12 4969 3 401 452 7Q2S3 Cairns, 1983 b Cairns 1983 [238,544,151,178] Hydrozoa Stylasteridae Stellapora Animalia Anthoathecata 31 32 Cnidaria genus    Typespecies.  Spinipora echinata Moseley, 1879  Included species.  Stellapora echinata(Moseley)   Distribution.SWA off Argentina, 357–1647 m(see Cairns 1983a). New record off Mar del Plata, 1144–1289 m.   Diagnosis.See Cairns 1983b.