Hydroiloida
Hydroiloida is a genus of marine annelid worms belonging to the family Nereididae. These polychaetes are characterized by their segmented bodies and parapodia, which are paired, fleshy appendages used for locomotion and respiration. Members of the Hydroiloida genus are typically found in marine environments, inhabiting various substrates such as sand, mud, and among sessile invertebrates. They are deposit feeders, using specialized mouthparts to ingest organic matter from their surroundings. The exact taxonomic placement and species within Hydroiloida can be subject to ongoing research and revision within the field of marine invertebrate zoology. Further detailed study is often required to differentiate between species due to subtle morphological variations.