| 3 | BIOGEOGRAPHY AND PHYLOGENY OF THE SEA-SKATER HALOBATES显示文摘Members of the genus Halobates are the only insects to be found in the open oceans .generally roughly between latitudes 40°N and 40°S . Of the 40 - odd species , only five (Halobates means. H- sericeus. H. germanus. H . sobrinus and H. splendens tare pelagic > the others being found in near - shore habitats . often endemic to islands or island groups. H. means is the only cosmopolitan species, being found in the Atlantic . Pacific and Indian Oceans . All five species are found in the Pacific Ocean but only two , Halobates means and Halobates germanus. occur also in the Indian Ocean .Their ranges of distribution are probably limited by physical as well as historical factors .Halobates probably originated from a near - shore brackish - water ancestor in the Indo - Malaysian region . This is the area where the majority of the near - shore sea - skater species are found ;it is also where related brackish - water genera (Asclepios , etc . )occur . There are indications that the open - ocean H alobates | Lanna Cheng (A - 002 Scripps Institution of Oceanography La Jolla, California 92093 , U.S.A. ) | 1989 | Chinese Journal of Oceanology and Limnology1989，7，3： | 0 |
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