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Several specimens of benthic siphonophorae of the family Rhodaliidae were recorded during dives of the ROV “Comanche 18” at depths of 1711–1914 m in vicinity of submarine Piyp Volcano located north off Commander Islands in NW Pacific. The specimens were not collected, but recorded in details on video files and photographic images underwater in their natural habitat. Unlike other siphonophores the members of the family Rhodaliidae are benthic. Almost all species of this family are poorly known, and most are known from very few specimens, some of which were collected more than 100 years ago and newer recorded again. Till now rhodaliids were not known from NW Pacific at depths greater than 1000 m. In the present paper we describe a brief history of the family, the morphology of the recorded here specimens basing on photo and video data, and provide a list of all described species of the family with short comments on each. It is shown that the generic name Tridensa Hissmann, 2005 is not available and cannot be used. How to cite this article: Sanamyan K.E., Sanamyan N.P., Galkin S.V., Ivin V.V. 2018. A record of deep-water benthic siphonophore (Siphonophorae: Physonectae: Rhodaliidae ) in vicinity of submarine Piyp Volcano (North-Western Pacific) // Invert.Zool. Vol.15. No.4. P.323–332. doi: 10.15298/invertzool.15.4.01

A record of deep-water benthic siphonophore (Siphonophorae: Physonectae: Rhodaliidae) in vicinity of submarine Piyp Volcano (North-Western Pacific)