FIGURES 4–7. Retevirgula asiana n in Systematics of some calloporid and lacernid Cheilostomata (Bryozoa) from coastal South Korean waters, with the description of new taxa

FIGURES 4–7. Retevirgula asiana n. sp., Stn I3 near Cheongsan Island. 4, Unbleached zooids with periopesial spines; scalebar 400 µm. 5, Part of a colony with numerous kenozooids and an interzooidal avicularium (arrow); scalebar 200 µm. 6, Part of a colony showing kenozooids with spine bases and a retained entire spine (arrows); scalebar 400 µm. 7, Close-up of the avicularium shown in fig. 5; scalebar 50 µm.