Nematodes (likely free-living or saprophytic)

Natural Habitat

Nematodes are ubiquitous and can be found in almost every environment on Earth. They are extremely common in soil, marine and freshwater environments, and as parasites of plants and animals. The image suggests an aqueous or moist environment, possibly a petri dish or a wet sample.

Diet & Feeding

The diet of nematodes is highly varied depending on the species. Free-living nematodes found in soil or water typically feed on bacteria, fungi, algae, diatoms, decaying organic matter, or even other small nematodes. Some are predatory. Given the appearance, these are likely feeding on bacteria or detritus.

Behavior Patterns

Nematodes move in a characteristic undulating or thrashing motion, which is often how they are identified under a microscope. Free-living species actively feed on microorganisms or organic matter. Parasitic nematodes often have complex life cycles involving one or more hosts and different developmental stages. They reproduce sexually.

Risks & Benefits

Benefits of free-living nematodes include their role in nutrient cycling in soil and aquatic ecosystems (decomposers, regulators of microbial populations). They are also a food source for other organisms. Some are used as biological control agents against insect pests (entomopathogenic nematodes). Risks primarily come from parasitic species: plant parasitic nematodes can cause significant agricultural crop damage, and animal parasitic nematodes (including human parasites like pinworms, hookworms, or filarial worms) can cause a range of diseases from mild to severe, and even fatal conditions.

Identified on: 8/29/2025