A small creature wriggling quietly in a pond or rice field,
a soft, flattened body,
and two powerful suction cups.

The true leech refers to freshwater leech species belonging to the phylum Annelida and class Hirudinea, such as Hirudo nipponia. These leeches are commonly found in ponds, wetlands, rice paddies, and slow-moving freshwater environments in East Asia.

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📌 Basic Information

• Phylum: Annelida
• Class: Hirudinea
• Habitat: Ponds, rice fields, streams, wetlands
• Length: About 3–8 cm
• Lifespan: Approximately 2–5 years

True leeches are often found in relatively clean freshwater habitats.

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🪱 Physical Characteristics

✔️ Flattened, elongated body
✔️ Two suction cups (one at each end)
✔️ Brown to dark brown coloration
✔️ Segmented body structure

The front sucker contains small teeth that allow the leech to pierce skin and feed on blood.

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🌊 Ecology & Lifestyle

True leeches are primarily parasitic blood feeders.

• Feed on the blood of fish, amphibians, and mammals
• Wait in ambush for a host
• Can survive long periods without feeding

During feeding, they secrete anticoagulant substances that prevent blood from clotting.

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🧪 Medical Use

✔️ Produce an anticoagulant called hirudin
✔️ Used in microsurgery to improve blood circulation
✔️ Historically applied in traditional medicine

Even today, leech therapy is used in certain medical treatments.

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⚠️ Precautions

• Do not forcibly remove a leech if attached
• Be aware of potential infection
• Take protective measures when entering wetlands

While leeches are part of natural ecosystems, caution is advised during direct contact.

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The true leech is:

🪱 A freshwater annelid with blood-feeding habits
🌊 A natural component of aquatic ecosystems
🧪 A creature with surprising medical significance

Though often viewed negatively,
leeches play important roles in both nature and modern medicine—
a reminder that even the most unexpected organisms can be fascinating and valuable.