Polydora sp. 2 ("Polychaeta", Spionida, Spionidae), late larva, length 900 µm, Helgoland 08.2011. 0:25 min. Spionid larvae can be found in the plankton during the whole year and in different stages. Early stages are very vivid. They are propelled by the prototroch and telotroch. The nectochaetes, starting with three-chaetiger larvae, may develop up to 20 chaetiger segments before settle down at the bottom. Video can be used for teaching.