Systematic study on Hydrozoans (Phylum Cnidaria) form Nansei Islands

1992-1994年间，对南海群岛的水生动物纲进行了系统的研究。在7个岛屿(Amami-Oshima、冲绳岛、AKA岛、宫古岛、石垣岛、黑岛、伊里奥莫特岛)的36个站进行了材料收集和实地工作，并通过实验室饲养水母，共鉴定出水母7目39属47种，以及水生水生动物2目21属27种。连同冲绳岛主要海岸已报道的2目25属30种水生水生动物，南海诸岛共有7目67属82种水生动物，显示了本区丰富的水生动物区系。本研究采集的所有水母类均为该地区的首次记录。其中13种为日本新记录或未鉴定种，并对其生长、染色体、配子和幼虫等进行了详细的描述。此外，个体变异的范围和生物地理数据与以前的记录一起汇编。从九州到北海道，南海岛采集的水生动物大多也分布在任何区域，目前仅有11种水母类和4种水生水生动物分布在南海岛。众所周知，南海诸岛的水母动物区系与台湾海峡和中国厦门一带的水母动物区系相似，那里的水母分类研究较多。

The systematic study of the Class Hydrozoa (PhylumCnidaria) in the Nansei Islands has been conducted during 1992-1994. The collection of materials and field work was done at 36 stations on seven islands (Amami-oshima, Okinawa Island, Aka Island, Miyako Island, Ishigaki Island, Kuroshima Island, Iriomote Island) and through laboratory-rearing hydromedusae of 47 species of 39 genera (7 orders) and hydropolyps of 27 species of 21 genera (2 orders) were recognized. Together with hydropolyps of 30 species of 25 genera (2 orders) which were already reported from mainly shores of Okinawa Island, a total of 82 species of 67 genera (seven orders) are distributed in Nansei Islands, showing a rich hydrozoan fauna in this study area. All hydromedusae collected in the present study are the first record in this area. Among them, 13 species are new to Japan or unidentified, and the growth, cnidome, gametes, and larva of most of these medusan species were clarified. Further, range of individual variation and biogeographical data were compiled together with former records. Most of the hydrozoans collected in the Nansei Islands are also distributed in any given area from kyushu to Hokkaido, and at present hydromedusae of 11 species and hydropolyps of 4 species are exclusively distributed in the Nansei Islands. It is known that hydromedusa fauna in the Nansei Islands are similar to that of Taiwan Strait and around Amoy, China where the taxonomic study of hydromedusae were well studied.