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 dichotoma (Linnaeus, 1758) ( fig. 5 G) Sertularia dichotoma Linnaeus, 1758: 812 . Obelia dichotoma – Cornelius, 1975: 265, figs 3–4 . – Cornelius, 1995b: 296, fig. 69. Material examined. Stn. T10 , 15.ii.2007 : one small, sterile stem, on plumose bryozoan. Distribution . Nearly cosmopolitan in coastal waters (Cornelius 1995b). This is the first record of this species for Tristan da Cunha .