Fig. 8 in Morphology of larval and postlarval stages of Priapulopsis bicaudatus (Danielssen, 1869) (Priapulida) from the north atlantic ocean

Fig. 8. Postlarval stages: trunk. A, D. The trunk is covered by tumuli. B, C. The ventral midline (vml) is elevated. E. In one specimen, scattered papillae (encircled) are present on the trunk. F. In magnification, these papillae have pointed receptors with an apical tubulus (arrows). G, H. Posterior end of the adult with three rings of ringpapillae (arrows). I. The ringpapillae have a frontal groove. The arrow indicates the region of receptors shown in J. J. Several receptors (arrows) are present apically on the ringpapillae. K. View on the caudal side of the ringpapillae from the third ring, the arrow indicates the region of receptors. L, M. Ringpapillae (arrows) are present in the larger postlarval stages. Note papilla with a groove at lower side of M. N. Magnification of ringpapilla with one apical receptor. Further abbreviations: ca = caudal appendage, in = introvert, tr = trunk, tu = tubuli. All images except G by SEM, A-C from V13484, D from V13502, E, F, M from V13498, G-K from V13492, L, N from specimen 9-2 of V13493.