Fig. 13 in Morphology of larval and postlarval stages of Priapulopsis bicaudatus (Danielssen, 1869) (Priapulida) from the north atlantic ocean

Fig. 13. Postlarval stages: Pharyngeal teeth of ring 2 (A–D), ring 3 (E–G) and tooth receptors. A-C show development of second-ring teeth in three specimens of different size, note different size of the central spine. Note also tooth receptors (arrows) on spines. D. Magnification of tooth receptors (arrows) and a small secondary spine (encircled). E, F. Third-ring tooth in two stages of different size with different intensity of back spines coverage. Arrowheads in E point at secondary spines, arrows in F at tooth receptors. G. Magnification of tooth receptors (arrows). H–N. Presence of tooth receptors (encircled or arrow) on different teeth from the adult (V13492), in ring 4 (H), 5 (I) and further. L. In the adult, posterior of toothring 6 the pharyngeal teeth become distinctly smaller. All images SEM, A from specimen 8-4 of V13493, B, D from V13484, C from V13477, E fromV13498, F from V134482, G from V13499, H-L from V13492.