Figure 6

Innervation of the lophophore and alpha-tubulin immunoreactive elements in Phoronopsis harmeri at different stages of metamorphosis. In all images, the apical is at the top. (A) First stage of metamorphosis; several tentacles viewed from the frontal side. The oral side is to the right. (B) The same stage; a part of the lophophore with tentacles viewed from the abfrontal side. The oral side is to the right. (C) The stage when the postoral ciliated band is ingested, several tentacles viewed from the abfrontal side. Medioabfrontal neurite bundles are indicated by arrowheads. Intertentacular branches are indicated by arrows. The oral side is to the right. (D) The same stage; anterior part of the body viewed from the right. (E) A 3-day-old juvenile; a part of the lophophore with tentacles viewed from the frontal side. (F) The same stage; a part of the lophophore with tentacles viewed from the abfrontal side. (G) A 3-day-old juvenile; the upper part of the esophagus. (H) A 3-day-old juvenile; a part of the trunk body wall. Abbreviations: ep – epistome; eps – epithelium of the esophagus; itb – intertentacular branch; la – lateroabfrontal neurites in tentacle; lf – laterofrontal neurites in tentacle; m – mouth; ma – medioabfrontal neurites in tentacle; mf – mediofrontal neurites in tentacle; mnr – minor nerve ring; nc – nephridial channel; ptn – prominent trunk neurite bundle; tn – tentacular (main) nerve ring; trn – trunk neurites; trp – trunk perikarya; tt – telotroch.