FIGURE 19 in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 19. Rhamphostomella sibirica (Kluge, 1929). ZIRAS 34/50113 (Medny Island, Commander Islands, Bering Sea). A. Colony margin with developing zooids and ooecia. B. Zooids near colony margin showing form of primary orifice with lyrula. C. Suboral avicularium and lyrula. D. Group of non-ovicellate zooids in young part of colony. E. Zooids with developing ooecia. F, G. Ovicellate zooids in older parts of colony. H. Ovicellate zooid in older part of colony. I. Interior of frontal shield, showing lyrula, umbo, ring scar, areolae and ooecial communication pore (arrow). J. Basal surface of colony with tubular protuberances. K. Interior of frontal shield, showing ring scar and exterior wall microstructure of umbonuloid component. L. Lateral view of zooid, showing suboral avicularium and zooidal lateral wall with mural pore chambers. Scale bars: A, D, G, J, 500 μm; B, E, F, 250 μm; C, K, 50 μm; H, I, 100 μm; L, 200 μm.