FIGURE 18 in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 18. Rhamphostomella radiatula (Hincks, 1877). ZIRAS 19/50114 (Medny Island, Commander Islands, Bering Sea). A. Developing zooids with forming ooecia near colony margin. B. Distal view of marginal zooids with developing ooecia (arrows). C. Suboral avicularium. D. Non-ovicellate zooids in relatively young part of colony. E. Ovicellate (to the right) and non-ovicellate zooids with well-developed, bulge-like coarse tubercles of secondary calcification in older part of colony. F. Single ovicellate zooid, showing form of secondary orifice and ooecium in relatively young part of colony. G. Group of ovicellate zooids with ooecia overgrown by secondary calcification in relatively young part of colony. H. Distal view of ovicellate zooids, showing suboral avicularium and median process in older part of colony. I. Interior of frontal shield, showing lyrula, ring scar and areolae. J. Close-up of frontal-shield interior, showing median lyrula. K. Basal surface of colony that was overgrowing another bryozoan colony, Celleporella hyalina. L. Interior of frontal shield, showing ring scar and exterior wall microstructure of umbonuloid component. M. Lateral section of zooids showing two ooecia, suboral avicularium, areolae (upper row) and zooidal lateral walls with mural pore chambers. Scale bars: A, B, G, H, 250 μm; C, J, L, 50 μm; D, K, 500 μm; E, F, I, 100 μm; M, 200 μm.