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Oniyanma 1
General Information
Universe Real Life
Aliases Golden-ringed Dragonfly, Jumbo Dragonfly, Siebold's Dragonfly
オニヤンマ、鬼蜻蜓、馬大頭 (Oniyanma)
장수잠자리 ("jang-su-jamjari", means 'General Dragonfly')
Classification Anotogaster sieboldii
Homeworld Earth
Intelligence Non-sapient
Biochemistry Carbon-based lifeforms
Discovered 1854
Discoverer Edmond de Sélys Longchamps
Biological Information
Reproduction Sexual; lays eggs
Average Length 95 - 100 mm
Locomotion Powered flight
Feeding Behavior Carnivorous
Lineage Information
Cultural Information
Alignment True Neutral
Sociocultral characteristics
Scientific Taxonomy
Planet Earth
Domain Eukaryota
Kingdom Animalia
Subkingdom Eumetazoa
Infrakingdom Bilateria
Superphylum Ecdysozoa
Phylum Arthropoda
Subphylum Hexapoda
Class Insecta
Subclass Pterygota
Infraclass Palaeoptera (disputed)
Superorder Odonatoptera
Order Odonata
Suborder Anisoptera
Family Cordulegastridae
Genus Anotogaster
Species sieboldii
Other Information

The Oniyanma (Anotogaster sieboldii), also known as the golden-ringed dragonfly, jumbo dragonfly, or Siebold's dragonfly, is the largest species of dragonfly native to Eastern Asia, especially Japan, China, Korean Peninsula. It can grow between 95 and 100 mm in length.

Life cycleEdit

Eggs hatch within a month of being laid. Nymphs can live for three to five years, moulting as many as ten times and growing as large as five centimeters in length. Like adult dragonfly, nymphs are obviously predatory insects. Once nymphs' size bigger and bigger, they hunt tadpoles, aquatic insects and small fish. The adult dragonfly mate and lay eggs within one to two months of metamorphosis. After mating, females head toward small creeks or ponds, not fast-moving rivers or lakes, to lay eggs. They will sometimes fly perpendicularly to the water, laying their eggs in mud or sand under the surface.

Oniyanma 2

An adult on a twig. photographed in Nasu Highlands of Tochigi, Japan

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