Fig. 9
Expression of Aen-Gsx during late-stage trochophores of the scaphopod Antalis entalis. Dorsal (d)–ventral (v) and left (l)–right (r) axes indicate the orientation. The statocysts are labeled with asterisks. Optical sections from anterior (a) to posterior (b) in a 63 hpf old trochophore (all with same orientation and scale bar as indicated in a). a One cell cluster on each side expresses Aen-Gsx in the region of the cerebral ganglia (black dashed circles). b Two cell clusters (red dashed circles) express Aen-Gsx ventro-laterally to the statocysts, in the region of the prospective pedal ganglia. A pair of Aen-Gsx-expressing cells is located in the region of the pavilion (pv). c Aen-Gsx is expressed in the ventral portion of the foot (green dashed circle). m mantle, pt prototroch. Scale bar 50 µm