Sertularia geniculata Linnaeus, 1758: 812 Obelia geniculata Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic Galea, Horia R. Zootaxa 2010 2336 1 18 488Y7 Linnaeus, 1758 Linnaeus 1758 [151,580,847,873] Hydrozoa Campanulariidae Obelia Animalia Leptothecata 12 13 Cnidaria species geniculata    Sertularia geniculataLinnaeus, 1758: 812.   Obelia geniculata– Cornelius, 1975: 272, figs 1, 5. – Cornelius, 1995b: 301, fig. 70.   Material examined. Stn. T14, 23.ii.2005: several sterile, poorly-preserved stems, up to 10 mmhigh, on  Macrocystis pyrifera.   Distribution. Previously collected by the S.Y.  Scotiafrom the fronds of  Macrocystis pyriferaat Gough Island (Ritchie 1907). This is a near-cosmopolitan species, penetrating high latitudes in the northern hemisphere and into sub-Antarctic waters in the southern hemisphere (Medel & Vervoort 2000).