Fig. 4 in Morphology of larval and postlarval stages of Priapulopsis bicaudatus (Danielssen, 1869) (Priapulida) from the north atlantic ocean

Fig. 4. Larvae, habitus and internal structure. A. Example of a specimen, where the larval body does not completely fill out the lorica volume. A funnelshaped structure (fu) connects the putative anus with the posterior lorica margin. B, C. Examples of specimens, in which the larval body fills the lorica completely. D. Magnification of the funnel-structure. E. Larva in (putative) molt, ex = exuvia, recognizable by the molted scalids (arrow). F–H. Internal structure showing compartmentalization of the intestine in larvae with withdrawn introvert into a thicker pharyngeal region (ph), midgut (mg) and a more slender part (arrows), ending in the anus (an). In specimens with everted introvert, the intestine appears straight. All images by light microscopy. A, D from two different specimens of V13478, B from larva 1 of V13493, C from larva 3 of V13500, E from larva 1 of V13497, F from larva 12 of V13494, G from V13490, H from larva 1 of V13496.