Monobathrids

Monobathrids are a family of polychaete worms belonging to the order Phyllodocida. These marine annelids are characterized by their single, unpaired ventral pharynx, a feature that gives them their name. Unlike many other polychaetes, monobathrids possess a relatively simple body plan with few distinct segments. Their parapodia, the paired appendages on each segment, are typically small and reduced, lacking the prominent chaetae (bristle-like structures) found in many other polychaete groups.

These worms are primarily benthic, meaning they live on the seafloor, often inhabiting soft sediments like sand or mud. Their feeding habits vary, with some species being deposit feeders, consuming organic matter from the sediment. Others may be more predatory, feeding on small invertebrates. Monobathrids are found in a variety of marine environments, from intertidal zones to deep-sea habitats, across temperate and tropical regions. Their reproductive strategies are diverse, with both sexual and asexual reproduction observed within the family. While not as extensively studied as some other polychaete families, monobathrids play a role in benthic ecosystems, contributing to nutrient cycling and serving as a food source for other marine organisms.