FIGURE 23. Rhamphostomella spinigera Lorenz, 1886. A–F, H, I, L. ZIRAS 26 in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 23. Rhamphostomella spinigera Lorenz, 1886. A–F, H, I, L. ZIRAS 26/50112 (Medny Island, Commander Islands, Bering Sea). G, J, K. ZIRAS 25/50111 (Bering Island, Commander Islands, Pacific Ocean). A. Colony margin with developing zooids, suboral avicularia and ooecia. B. Orifice with two pairs of oral spines, showing lyrula, lateral denticles and suboral avicularium. C. Zooidal orifice with developing ooecium (partially seen), one pair of oral spines and suboral avicularium. D. Non-ovicellate autozooids (number of oral spines varies from two to four). E. Non-ovicellate zooid (upper right corner) and two zooids with partially developed ooecia, possibly "aborted". F. Zooids with developing ooecia. G. Ovicellate zooids, some with detached articulated oral spines (colony partially cleaned). H. Frontal view of distal part of ovicellate zooid. I. Interior of frontal shield, showing umbo, ring scar and areolae. J. Basal surface of colony. K. Interior of frontal shield, showing ring scar around exterior-wall microstructure of umbonuloid component, and lyrula with lateral denticles. L. Lateral view of zooid, showing ooecium, oral spines, peristomial lappet and lateral wall with mural pore chambers. Scale bars: A, J, 500 μm; B, C, E, F, H, I, 100 μm; D, G, 250 μm; K, 50 μm; L, 200 μm.