Nematodes

Nematodes or roundworms constitute the phylum Nematoda, with over 25,000 different described species, making them one of the most diverse groups in the animal kingdom. They are a diverse animal phylum inhabiting a broad range of environments.

Taxonomy

Nematodes are classified into the kingdom Animalia, the phylum Nematoda, and the class Chromadorea or Enoplea, depending on the species.

Anatomy

Nematodes' bodies are covered in a tough outer layer called a cuticle. They have a simple structure with a hollow gut running from the mouth to the anus, and a nerve ring around the pharynx.

Life Cycle

The life cycle of a nematode includes six stages: an egg stage, four juvenile stages, and an adult stage. The duration of each stage can vary depending on the species and environmental conditions.

Ecology

Nematodes play crucial roles in the ecosystem, including decomposition and nutrient cycling. Some species are parasitic, infecting humans, animals, and plants.

Human Health

Some nematodes, such as the hookworm and the pinworm, are parasitic and can cause diseases in humans. Others, like the Caenorhabditis elegans, are used in scientific research.

Agriculture

Nematodes can have a significant impact on agriculture. Some species are beneficial, aiding in nutrient cycling, while others are harmful, causing crop diseases.

See Also

• Parasitology
• Soil biology
• Helminthology