FIGURE 4. Manayunkia caspica Annenkova, 1929 in Redescription of Manayunkia caspica Annenkova, 1929 and M. danubialis Băcescu, 1944 n. comb. (Fabriciidae, Sabellida, Polychaeta)

FIGURE 4. Manayunkia caspica Annenkova, 1929, semithin sections (1 µm) through radiolar crown. A. Branches of radioles and ventral vascularized filamentous appendages, all separated. B. Branches of ventral and median radioles start to fuse (110 µm basal of section A). C. Fusion of branches of ventral and median radioles continues, dorsal radioles still separated; dorsal lips visible (30 µm basal of section B; note: dorsal radiole of the right and left half of the radiolar crown lettered). D. Ventral and median radioles fused, dorsal radioles and dorsal lips separated (12 µm basal of section C). E. Radioles fused, and connected to ventral vascularized filamentous appendage by dorsal lips, except left dorsal radiole (10 µm basal of section D). F. Radioles completely fused, ventral anterior peristomial ring lobe visible (30 µm basal of section E). Scale bars A–F 100 µm (abbr: dl dorsal lips, dr dorsal radiole, mr median radiole, v aprl ventral anterior peristomial ring lobe, vr ventral radiole, vvfa ventral vascularized filamentous appendages).