title: Green Fluorescence of Cytaeis Hydroids Living in Association with Nassarius Gastropods in the Red Sea.
abstract: Green Fluorescent Proteins (GFPs) have been reported from a wide diversity of medusae, but only a few observations of green fluorescence have been reported for hydroid colonies. In this study, we report on fluorescence displayed by hydroid polyps of the genus Cytaeis Eschscholtz, 1829 (Hydrozoa: Anthoathecata: Filifera) found at night time in the southern Red Sea (Saudi Arabia) living on shells of the gastropod Nassarius margaritifer (Dunker, 1847) (Neogastropoda: Buccinoidea: Nassariidae). We examined the fluorescence of these polyps and compare with previously reported data. Intensive green fluorescence with a spectral peak at 518 nm was detected in the hypostome of the Cytaeis polyps, unlike in previous reports that reported fluorescence either in the basal parts of polyps or in other locations on hydroid colonies. These results suggest that fluorescence may be widespread not only in medusae, but also in polyps, and also suggests that the patterns of fluorescence localization can vary in closely related species. The fluorescence of polyps may be potentially useful for field identification of cryptic species and study of geographical distributions of such hydroids and their hosts.
authors: Department of Invertebrate Zoology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia.
authors: Andrey A
authors: AA
authors: Prudkovsky
authors: Department of Invertebrate Zoology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia.
authors: Viatcheslav N
authors: VN
authors: Ivanenko
authors: A.N. Belozersky Institute of Physico-chemical Biology, Lomonosov Moscow State University, Moscow, Russia.
authors: Mikhail A
authors: MA
authors: Nikitin
authors: Institute of Bioorganic Chemistry, Moscow, Russia.
authors: Konstantin A
authors: KA
authors: Lukyanov
authors: Department of Invertebrate Zoology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia.
authors: Anna
authors: A
authors: Belousova
authors: Molecular Invertebrate Systematics and Ecology Laboratory, Department of Biology, Chemistry, and Marine Sciences, Faculty of Science, University of the Ryukyus, Okinawa, Japan.|Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan.
authors: James D
authors: JD
authors: Reimer
authors: Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
authors: Michael L
authors: ML
authors: Berumen
mesh_terms: D000818:Animals; D005453:Fluorescence; D049851:Gastropoda; D049452:Green Fluorescent Proteins; D037402:Hydrozoa / Q000145:classification / Q000235:genetics; D019156:Indian Ocean; D008856:Microscopy, Fluorescence; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012529:Saudi Arabia
chemical_list: D012337:RNA, Ribosomal, 18S; D049452:Green Fluorescent Proteins