Urechis unicinctus

Urechis unicinctus

Urechis unicinctus, also known as the fat innkeeper worm or the penis fish, is a species of marine spoon worm. It is widely recognized for its unique shape and is a common delicacy in East Asian cuisine, particularly in South Korea and Japan.

Taxonomy

Urechis unicinctus belongs to the phylum Annelida, a large group of segmented worms, and the class Echiura, commonly known as spoon worms. The species is the most well-known member of the genus Urechis.

Description

The body of Urechis unicinctus is cylindrical, soft, and pinkish in color. It can grow up to 30 cm in length. The worm is often compared to a human penis, hence the nickname "penis fish".

Habitat and Distribution

Urechis unicinctus is found in the coastal waters of the Pacific Ocean, particularly in East Asia. It prefers muddy sand substrates where it can burrow and create U-shaped burrows.

Diet

The diet of Urechis unicinctus consists mainly of detritus and plankton. The worm feeds by extending a mucus net from its burrow to trap food particles.

Reproduction

Urechis unicinctus reproduces sexually. The female releases eggs into the water, which are then fertilized by the male. The fertilized eggs develop into larvae, which eventually settle on the seafloor and grow into adult worms.

Human Use

Urechis unicinctus is a popular food item in East Asia. In South Korea, it is known as "gaebul" and is often eaten raw with a spicy dipping sauce. In Japan, it is called "namako" and is used in a variety of dishes.

See Also

• Annelida
• Echiura
• Urechis

References

• Urechis unicinctus - Taxonomy
• Marine Species Identification Portal: Urechis unicinctus
• FishBase: Urechis unicinctus

External Links

• Encyclopedia of Life: Urechis unicinctus
• Global Biodiversity Information Facility: Urechis unicinctus