title: The 'Antenna Balloon Anemone' Found in the Seto Inland Sea: New Genus and Species of Sea Anemone, Antennapeachia setouchi (Cnidaria, Actinaria, Haloclavidae).
abstract: In the present study, we report the identification of a sea anemone, Antennapeachia setouchi, collected in the Seto Inland Sea, which represents a new genus and new species. This new species has unusual tentacle and mesenterial arrangements that have not been observed in other species of Haloclavidae. There are 12 regular marginal tentacles and two 'antenna tentacles,' with the latter always rising upward and located on the oral disk near the mouth; the species is also characterized by its peculiar mesenterial pairs, consisting of a macrocneme and a microcneme. Furthermore, this species shows an interesting behavior: it can inflate its body like a balloon, lift above the seafloor, and drift with the sea current. The presence of a single, strong siphonoglyph, physa-like aboral end, and the lack of sphincter muscle classify this sea anemone within Haloclavidae. It resembles Peachia species, but cannot be classified in this genus as the new species has two pairs of mesenteries, consisting of a macrocneme and a microcneme, and irregular antenna tentacles. Therefore, we propose a new genus Antennapeachia to accommodate this species.
authors: 1 Department of Biological Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors: Takato
authors: T
authors: Izumi
authors: 2 Coastal Branch of Natural History Museum and Institute, Chiba, Kastuura-shi, Chiba 299-5242, Japan.
authors: Kensuke
authors: K
authors: Yanagi
authors: 1 Department of Biological Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.|3 Department of Zoology, National Museum of Nature and Science,Tsukuba-shi, Ibaraki 305-0005, Japan.
authors: Toshihiko
authors: T
authors: Fujita
mesh_terms: D063147:Animal Distribution; D000818:Animals; D007564:Japan; D012615:Sea Anemones / Q000033:anatomy & histology* / Q000145:classification*
keywords: Japan; NSMT; Pacific; R/V Toyoshio-Maru; marine invertebrates; sea anemone; species description