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🧬 Biological Classification (Kingdom to Species)Chasmagnathus convexus

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Varunidae

Genus

Chasmagnathus

Species

Chasmagnathus convexus

Malacostraca🍂 Omnivore

Chasmagnathus convexus

Chasmagnathus convexus (Chasmagnathus convexus · ハマガニ)

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

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

🇰🇷 Class II endangered wildlife (Korea)

Geological Era

Extant

Diet

Omnivore

Length · Height

4cm · No data

Mass · Top Speed

No data · No data

Habitat & Fossil Locality

Upper grasslands along coasts with well-developed tidal flats, estuarine ditches and wetlands

💡 Everyday Comparisons for Size, Mass & Speed

💡 Its carapace length of 4 cm is about 1.5 times the diameter of a Korean 500-won coin (26.5 mm) (Comparison).
💡 Habitat development along with dumping household waste is cited as a major threat to this crab.

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.

#갯게#Chasmagnathus convexus

📖 1. Overview

Chasmagnathus convexus is a purplish crab that digs burrows in upper grasslands along coasts with well-developed tidal flats and in estuarine ditches.

🦴 2. Anatomy & Morphology

Its carapace is quadrangular with convex sides, the body is purplish overall, and there is a deep longitudinal groove on the back. Males have larger claws than females, both claws are similar in size, and closing the pincers leaves a figure-8-shaped gap.

🔍 3. Ecology & Behavior

It mainly eats carcasses of various organisms and organic matter. Egg-bearing females are seen from June to September, but because its numbers are small, its breeding habits are not well known.

🇰🇷 4. Connection to Korea

In Korea, it is a Class II endangered wildlife (Korea). In the past it was recorded around tidal flats nationwide, but recently it is found only in parts of the southern coast and Jeju Island.