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🧬 Biological Classification (Kingdom to Species)Gyrinus japonicus

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Gyrinidae

Genus

Gyrinus

Species

Gyrinus japonicus

Insecta🥩 Carnivore

Gyrinus japonicus

Gyrinus japonicus (Gyrinus japonicus · Gyrinus japonicus)

🛡️ Conservation Status (IUCN Red List)NE (Not Evaluated)

Not Evaluated (NE) on the IUCN Red List yet.

Geological Era

Extant

Diet

Carnivore

Length · Height

0.8~1cm · No data

Mass · Top Speed

No data · No data

Habitat & Fossil Locality

Still-water areas with almost no current such as rice paddies and wetlands, and waterside areas with vegetation

💡 Everyday Comparisons for Size, Mass & Speed

💡 Its body length of 10 mm is slightly more than half a Korean 10-won coin (diameter 18 mm) (Comparison).
💡 Because the National List of Species of Korea notes that it lives in places with almost no current such as rice paddies and wetlands, it can be encountered in rural rice paddies.

Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.

#물맴이#Gyrinus japonicus

📖 1. Overview

Gyrinus japonicus is a small beetle living on the water surface of rice paddies and wetlands, distributed nationwide in Korea and also living in Japan and China.

🦴 2. Anatomy & Morphology

Its oval body is 8–10 mm long and black, with 11 rows of punctures on its elytra. Its compound eyes are divided into an upper and lower pair, allowing it to see above and below the water surface at the same time.

🔍 3. Ecology & Behavior

It lives in still waters with almost no current, such as wetlands and rice paddies, or among waterside vegetation, where it preys on other aquatic insects.