FIGURE 16. Rhamphostomella obliqua n in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 16. Rhamphostomella obliqua n. sp. Holotype, ZIRAS 1/50541 (Simushir Island, Kuril Islands, Pacific Ocean). A. Colony margin, showing young zooids with developing ooecia (arrows). B. Oblique view of young zooids, showing early stages of developing ooecia and avicularian cystids (interareolar ridges on the frontal shields are well evident). C. Zooids with fully developed suboral avicularia and early developmental stages of ooecia. D. Oblique view of zooids with fully-developed avicularia (some also with ooecia in early stage of development). E. Autozooids with developing ooecia in young part of colony (interareolar ridges on frontal shield have not yet developed). F. Ovicellate zooids in older part of colony (interareolar ridges on frontal shield weakly developed). G. Group of ovicellate zooids in older part of colony (interareolar ridges on frontal shield weakly developed). H. Lateral view of distal half of ovicellate zooid. I. Interior of frontal shield, showing ring scar, areolae and ooecial communication slit (arrow) (openings surrounding ring scar are not pseudopores, but lower openings of areolae). J. Internal view of orifice, showing straight proximal margin and minute condyles. K. Basal surface of colony. L. Interior of frontal shield, showing ring scar and exterior wall microstructure of umbonuloid component. M. Lateral view of zooid, showing suboral avicularium and zooidal lateral wall with mural pore chambers. Scale bars: A, D, G, K, 500 μm; B, C, E, F, H, 250 μm; I, J, 100 μm; L, 50 μm; M, 200 μm.