Figure 3

A Cut-out showing the neck region of a larva with a flosculus (asterisk) situated at the transition of introvert (I) to neck (N). Arrowhead points to filiform structure emanating from the terminal pore of the flosculus. B Magnification of the flosculus seen in A. Arrowhead as in A. C Flosculus found on another not shown larva. Arrowhead as in A. D Magnified anterior part of the larva shown in Fig. 2F. Anterior is up. Arrows point to the two flosculi at opposite sites of the larva. E/F Magnification of the lower (E) and upper (F) flosculus shown in D. Arrows point to terminal pores. Arrowheads as in A. G Larva with prominent protrusion at the rear end. Anterior is up. Dot marks posterior tubulus. H Magnification of the protrusion shown in G from a different angle. I Larva with two visible posterior tubuli (dots). J Larva with three visible posterior tubuli (dots). Nearby tubuli mark lateral. Position of distant tubuli mark ventral and dorsal respectively. K Three first-ring scalids, two of which are seen in situ in J marked by numbered asterisks. The third (right) belongs to the larva shown in Fig. 2A/B. Lateral (left) view, ventral (middle) view and dorsal (right) view. Note that the scalid in the middle is with a branched tip, the others are with a single tip. Arrow marks dorsal ridge. Arrowhead points to a micro-spine. L Magnification of the tubulus marked with "pt*" in I. Abbreviations as in Fig. 2; b, base of flosculus; p, papillae; pt, posterior tubulus.