Lanice conchilega ("Polychaeta", Terebellida, Terebellidae), larva aulophora III, length 1.8 mm, Helgoland 06.2019. 0:52 min. The unique development of Lanice conchilega leads to an early larva, which settles for shortly at the bottom, then forming a tube and starting a second planktonic life as aulophora with 3 stages. The transparent tube, open at both ends, is often covered by mud and small particles. Video can be used for teaching.