The purpose of this application is to conserve the names Desmophyes annectens Haeckel, 1888, under Article 23.9.3 of the Code, and Rosacea plicata Bigelow, 1911, under Article 23.9.5, for two widely distributed (but rare in the former case) species of calycophoran prayid siphonophores. D. annectens is a junior synonym of Rosacea plicata Quoy & Gaimard, 1827. Bigelow used the name R. plicata for a different taxon. The name R. plicata is in prevailing use for the species described by Bigelow and introduction of a new name for this species would cause nomenclatural confusion, as would use of the name R. plicata Quoy & Gaimard, 1827 for the species currently known as D. annectens. Conservation of the names D. annectens Haeckel, 1888 and R. plicata Bigelow, 1911 and of the usage of the generic name Rosacea Quoy & Gaimard, 1827 by the designation of R. plicata Bigelow, 1911 as the type species of Rosacea Quoy & Gaimard, 1827 is proposed.
