FIGURE 21. Rhamphostomella townsendi Osburn, 1952. A, E, G. Holotype, USNM 11032 in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 21. Rhamphostomella townsendi Osburn, 1952. A, E, G. Holotype, USNM 11032 (Santa Rosa Island, Pacific Ocean). B, D. Specimen AL–WP–0019–0022, M.H. Dick Collection (Amchitka Island, Aleutian Islands, Bering Sea). C, F, H, I, K. ZIRAS 1/50117, J, L. ZIRAS 2/50118 (Medny Island, Commander Islands, Bering Sea). A. Colony margin with developing zooids and ooecia. B. Orifice of non-ovicellate zooid, showing lyrula, lateral denticles and bases of oral spines. C. Suboral avicularium. D. Non-ovicellate zooids in young part of colony. E. Zooid with developing ovicell. F, H. Ovicellate zooids in older parts of colony. G. Zooids with developing and broken ooecia. I. Interior of frontal shield, showing blurred ring scar around umbonuloid component. J. General view of colony encrusting a sponge. K. Interior of frontal shield, showing blurred undulating ring scar and exterior wall microstructure of umbonuloid component. L. Zooid with broken frontal shield, showing areolae and lateral zooidal wall with mural pore chambers. Scale bars: A, D, G, J, 500 μm; B, H, I, 100 μm; C, K, 50 μm; E, F, 250 μm; L, 200 μm.