FIGURE 9 in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ

FIGURE 9. Median organ and ridge diversity in other Australian sabellariids. A. Lygdamis augeneri, AM W.27564, stained with methylene blue, with conical median organ, eyespots along median ridge; B. Lygdamis giardi, AM W.7958, with conical median organ (MO) and eyespots (white arrow) along median ridge (MR); C. Phalacrostemma maloga, AM W.27567, with a cylindrical and rounded distal end median organ as a prolongation of the median ridge; D. Tetreres terribilis, AM W.4994, lacking median organ, median ridge inconspicuous.