Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic Author Galea, Horia R. text Zootaxa 2010 2336 1 18 journal article 10.5281/zenodo.205235 58869148-c1e6-483c-9a76-0f1976cdeda9 1175-5326 205235 Obelia geniculata (Linnaeus, 1758) ( fig. 5 H) Sertularia geniculata Linnaeus, 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 mm high, on Macrocystis pyrifera . Distribution . Previously collected by the S.Y. Scotia from the fronds of Macrocystis pyrifera at 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).