FIGURE 9 in Scanning electron microscopy study of Lars Silén's cheilostome bryozoan type specimens in the historical collections of natural history museums in Sweden

FIGURE 9. Retevirgula triangulata (Silén, 1941). Holotype UPSZTY 2471, Bonin Islands, Japan. A. Group of zooids, some ovicellate, showing the spinose appearance of the colony. B. Group of zooids showing the proximal gymnocyst and tubular connections. C. Close-up of ovicells and an interzooidal avicularium. D. Close-up of an avicularium with open mandible and an autozooid with broken spines showing the extension of the proximal gymnocyst. E. Cluster of kenozooids (arrowed) and avicularia. F. Ovicellate zooids and a kenozooid. G, H. Close-ups of kenozooids. Scale bars: A, B = 400 µm; C, D = 120 µm; E, F = 200 µm; G, H = 100 µm.