The Golden-ringed dragonfly (in Japanese Oniyanma) Anotogaster sieboldii is the biggest dragonfly in Japan. It is also known as jumbo dragonfly or Siebold’s dragonfly. It is the largest species of dragonfly in Eastern Asia (Japan, China and the Korean Peninsula). It can reach a lenght of 100 mm. The A. sieboldii nymph lives three to five years, moulting up to ten times and growing as long as five centimeters during the process.
Female, male (flying) and nymph.