Mt. Takao is considered one of the three major habitat of insects along with Minoo (Osaka prefecture) and Kibune (Kyoto prefecture) and it has long been loved by researchers of insects because of number of species and the easy access from the Metropolitan area. There are many insects first found in Mt. Takao and named after "Takao" such as Takao Shachihoko （Hiradonta takaonis Matsumura） and Takao medaka kamikiri (Stenhomalus takaosanus).
Main region: Hokkaido, Honshu, Shikoku and Kyushu.
Found at streamside, grassland near watersides from flatland to low elevations.
Rest on stone or branches with their wings kept outspread.
Emerge from late May to about August.
Japanese name Ko-Oniyanma literally meaning small Oniyanma (Anotogaster Sieboldii) but they are in Gomphinae family.
The largest species in Gomphinae and have small head with same body size and have very long back legs compared to anotogaster sieboldii so it is easy to identified with.
Main foods are various insects including other dragonflies and cedars.
Male hold territory and rest on stone or branches and stay alert and patrol within the territory sometimes.
●Length about 80 to 90 mm
●Adult Flight Season May to about August
Found at streamside, grassland near watersides from flatland to low elevations.
Rest on stone or branches with their wings kept outspread.
Emerge from late May to about August.
Japanese name Ko-Oniyanma literally meaning small Oniyanma (Anotogaster Sieboldii) but they are in Gomphinae family.
The largest species in Gomphinae and have small head with same body size and have very long back legs compared to anotogaster sieboldii so it is easy to identified with.
Main foods are various insects including other dragonflies and cedars.
Male hold territory and rest on stone or branches and stay alert and patrol within the territory sometimes.
●Length about 80 to 90 mm
●Adult Flight Season May to about August