Clytia hemisphaerica (Linnaeus, 1767) Medusa hemisphaerica Linnaeus, 1767: 1098. Clytia hemisphaerica: Cornelius, 1995b: 252–255, fig. 57.— Gil & Ramil, 2025: 32 (synonymy). Material examined. Vertidos-2004: Stn. AG-AT-150-04, one colony without gonothecae growing on Sertularella gayi.—Stn. CH-EBS-150-04, one colony with gonothecae, growing on a polychaete tube. Biology. The biology of this species has been recently reviewed by Gil & Ramil (2025). Our material was found growing on S. gayi and on a polychaete tube. Gonothecae were found in September. Distribution. Clytia hemisphaerica is a circumglobal species (Calder 1991), and its bathymetric distribution ranges between 0 and 702 m (Peña Cantero & García Carrascosa 2002). Our material was collected at depths between 147– 150 m.

Published as part of Costas-Pérez, Javier, Rey, Alán, Gil, Marta & Ramil, Fran, 2026, Deep-water hydroids (Cnidaria: Hydrozoa) of Galicia (NW Spain), exclusive of Plumularioidea, pp. 151-187 in Zootaxa 5752 (2) on page 171, DOI: 10.11646/zootaxa.5752.2.1, http://zenodo.org/record/19171669