Figure 7 in New records of non-indigenous Branchiomma and Parasabella species (Sabellidae: Annelida) in South Australia highlight the continuing challenges for sabellid taxonomy

Figure 7. Parasabella sp. 1, drawing of cross section of radiole showing supporting vacuolated cells (with nuclei). Upper side of drawing shows outer margin of radiole, with columnar epithelial cells indicated in grey. Pinnules shown at the base of the image, with blood vessel in black.