FIGURE 3. A–B. Phascolosoma arcuatum. A in Peanut worms of the phylum Sipuncula from the Nha Trang Bay (South China Sea) with a key to species

FIGURE 3. A–B. Phascolosoma arcuatum. A) lateral view, retracted introvert; B) hook. C–D. P. nigrescens. C) ventral view, introvert everted; D) hooks of P. nigrescens. E–F. P. s c o l o p s. E) lateral view, introvert everted; F) hook (black arrow – triangle of hook; black arrowhead-clear streak). G–I. P. stephensoni. G) lateral view, retracted introvert; H) hook; I) the row of hooks (black asterisk-basal warts). Scale bars: A, 10 mm; B, 50 µm; C, 10 mm; D, 50 µm; E, 5 mm; F, 50 µm; G, 5 mm; H–I, 50 µm.