A study of evolutionary taxonomy of the japanese Mnais damselflies (Odonata, Calopterygidae)

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The present project was made during 1986 to 1987. The following results have been obtained so far.1. In 1986, I made an intensive survey of Mnais damselflies at 20 localities of the Island of Hokkaido and ascertained that in the island M. costalis populations always inhabit alone (Suzuki, 1987b).2. In 1986 and 1987, I and my collaborator (Mr. H. Kadowaki) made an intensive survey of this group at about 250 localities of Shimane Prefecture including Oki Islands (Suzuki & Kadowaki, 1986, 1987a, c). In Oki Islands (Dogo Island) only M. nawai Chugoku group population inhabits. In Shimane Prefecture proper M. nawai Chugoku group and M. pruinosa Nankai group populations are distributed. They occasionally co-occur in the same stream.3. In 1986 and 1987, I made an intensive survey of this group at many localities of Kyushu including Goto Islands and Koshiki Islands. In Kyushu, the following three Mnais species are distributed: 1. M. nawai Kyushu group, 2. M. pruinosa Nankai group, and 3. M. pruinosa Saikai group. Two of them occasionaly co-occur in the same stream. From Goto and Koshiki Islands, unique populations, which should be treated as independent subspecies respectively, were discovered. In particular, the Koshiki population is very important from the viewpoint of speciation ofMnais damselflies in the Japanese Islands. The combination of male and female forms of the population apparently corresponds to the undescribed new species M. sp., which is distributed in central Honshu (Suzuki, in preparation).