Figure 9. Spionidae head composition. A in Origin of the pointed snout in Scolelepis and the mouth region in spionid polychaetes (Annelida: Spionidae)

Figure 9. Spionidae head composition. A, Microspio microcera (Dorsey 1977), anterior end, ventral view. B, same, leħ lateral view, palps missing. C, Boccardia sp., anterior end, ventral view. D, Boccardia perata (Chlebovitsch 1959), anterior end, ventral view. E, Polydora rickettsi, anterior end, ventral view. F, Polydora ecuadoriana Blake 1983, leħ lateral view, palps missing. Abbreviations: do, dorsal ciliated fold; lp, lateral peristomial lip; pa, palp scar; pr, prostomium; s1, segment 1; vp, ventral peristomial lip. Scale bars: A, B, 50 µm; C, D, 200 µm; E, F, 100 µm. A, B, Carrie Bow Cay, Caribbean Sea, Belize (USNM 1459275). C, Rashua Is., Middle Kuriles, Russia (MIMB). D, Shikotan Is., South Kurile Is., Russia (USNM 183472). E, Coquimbo, Tongoy Bay, Chile (SMF 13491). F, Paranaguá Bay, Paraná, Brazil (USNM 1022185).