Body length 9 to 11 mm. The head is very long, half of the base is in the shape of a thin rod, there are annular wrinkles on the surface, and the end is like a snake's head. Its elongated head is much longer than its body, standing like a giraffe. Its unique shape is eye-catching. In our country, it is distributed in the Yangtze River Basin and the areas north of it, and abroad it is distributed in North Korea and Japan.
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