(fig. 4 H)
Sertularia dichotoma Linnaeus, 1758: 812.
Obelia dichotoma.— Hincks, 1868: 156 –157, pl. 28 figs 1, 1a–b.— Patriti, 1970: 36, fig. 45.—Cornelius, 1990: 550–555, figs. 2–3.— Ramil & Vervoort, 1992 b: 243 –244, fig. 68 c.— Cornelius, 1995 b: 296 –300, fig. 69.— Medel & López-González, 1996.— 206; Morri & Bianchi, 1999: 288.— Medel & Vervoort, 2000: 49 –53.—Peña Cantero & García Carrascosa, 2002: 161–162, fig. 31 b–c.
Obelia dichotoma p.p. Cornelius, 1975 a: 265 –272, figs. 3–4; 1982: 117 - 1.
Material studied. Ormonde, stn 3: few scattered colonies, on Zonaria tournefortii, DBUA 1523.01. Ormonde, stn 4: abundant on tuff of algae, well-developed colonies, epibionts: small algae; DBUA 1523.02. Reported distribution. Eastern Atlantic.—Widespread from Iceland (Kramp 1938) to South Africa (Millard 1975). Herein reported for the first time in the Gorringe Bank.
Mediterranean.—Widespread (e.g. García-Corrales et al. 1978; Vervoort 1993; Peña Cantero & García Carrascosa 2002).
Elsewhere.—Eurybathic species, apparently with nearly worldwide distribution (e.g. Cornelius 1995 b).