posted on 2021-05-13, 17:43authored byMichael G. Hadfield, Marnie L. Freckelton, Brian T. Nedved
A) Prototroch cilia are still attached when primary tube begins to form; B) Prototroch cilia shed while larva is in primary tube; C) Loss of food-groove cells and collar eversion. Scale bar: 20 μm. Ptc, Prototroch cells; PT, Primary Tube; PC, shed Prototroch cilia; Col, collar; FGC, food groove cells.