How does the bobbit worm catch prey?
Eunice aphroditois, often called the bobbit worm, is a long polychaete that buries in tropical seafloor sediment.
Body plan, feeding and the marine environment
Most of the body stays in sand while antennae and a powerful jawed head approach the surface. Chemical and tactile cues trigger a sudden strike at passing fish or crustaceans, which are dragged into the burrow. Popular claims that every strike cuts prey in half are exaggerated; outcome varies with prey size and contact. Relationships among marine invertebrates cannot be inferred from appearance alone because similar forms can evolve in different lineages. Pressure, light, temperature, salinity and currents shape feeding and movement. Laboratory observations may not represent the full behavior seen in nature.
Ecosystem function, defense and conservation
Its burrow can aerate nearby sediment and influence small organisms. The segmented body may repair some damage, but regeneration has limits. Individuals accidentally introduced with aquarium rock can remain hidden for long periods and should not be handled bare-handed because of the jaws. These animals may shape ecosystems through filtration, decomposition, sediment mixing or reef building. Warming, deoxygenation, acidification, plastic, seabed damage and overharvest are considered together. Conservation targets habitat processes as well as individual species.