FIGURE 6. Rhamphostomella microavicularia n in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 6. Rhamphostomella microavicularia n. sp. Holotype, ZIRAS 1/50543 (Chiproy Island, Kuril Islands, Pacific Ocean). A. Colony margin with developing zooids. B. Distal view of zooids from colony periphery, showing orifices with condyles and position of suboral and adjoining small adventitious avicularia. C. Orifice with suboral and adjoining adventitious avicularia (ooecial rudiment is visible near distal margin of orifice). D. Non-ovicellate zooids in young part of colony (arrows, communication pores of future ooecia). E. Zooids in older part of colony. F. Ovicellate zooid with ooecium, laterally surrounded by secondary calcification. G. Autozooids with complete and partially destroyed ooecia. H. Two zooids from old part of colony, showing numerous adventitious avicularia. I. Interior of frontal shield, showing umbonuloid component and areolae. J. Internal view of orifice, showing concave proximal margin and condyles. K. Basal colony surface. L. Frontal shield interior, showing ring scar and exterior wall microstructure of umbonuloid component. M. Zooidal lateral wall with mural pore chambers; protuberances on basal wall are clearly seen. Scale bars: A, D, G, K, 500 μm; B, E, F, H, 250 μm; C, I, J, 100 μm; L, 50 μm; M, 200 μm.