Figure 5. Scolelepis juvenile and adult morphology. A, complete 40 in Origin of the pointed snout in Scolelepis and the mouth region in spionid polychaetes (Annelida: Spionidae)

Figure 5. Scolelepis juvenile and adult morphology. A, complete 40-chaetiger juvenile, leħ lateral view. B, anterior end of a 60-chaetiger adult, frontal view. C, D, F, anterior ends, dorsal view. E, palps of the specimen shown on B. G, anterior end, leħ lateral view, leħ palp missing. Abbreviations: la, ciliated lateral organ; lp, lateral peristomial lip; nt, nototroch; nu, nuchal organ; pa, palp scar; pp, pointed peristomial process; sh, basal sheath on palp; s1, s2, segments 1, 2; arrow shows boundary between the pointed peristomial process and the prostomium. Scale bars: A, 200 µm; B–D, F, G, 100 µm; E, 50 µm. A, B, E, S. goodbodyi, São Sebastião, São Paulo, Brazil (MZUSP 251). C, Scolelepis sp. A, Paranaguá Bay, Paraná, Brazil. D, Scolelepis sp. B, Peter the Great Bay, Sea of Japan, Russia (MIMB). F, G, Scolelepis sp. C, Peter the Great Bay, Sea of Japan, Russia (MIMB).