FIGURE 4 in Taxonomy, ecology and zoogeography of the Recent species of Rhamphostomella Lorenz, 1886 and Mixtoscutella n. gen. (Bryozoa, Cheilostomata)

FIGURE 4. Rhamphostomella cristata (Hincks, 1889). ZIRAS 2/50110 (Medny Island, Commander Islands, Pacific Ocean). A. Colony margin with developing zooids. B. Distal view of non-ovicellate zooids, showing primary orifices and suboral avicularia. C. Suboral avicularium. D. Lateral view of non-ovicellate zooids, showing suboral avicularium and lobes of peristome. E. Group of non-ovicellate zooids in young part of colony (arrows, communication pores of future ooecia). F. Ovicellate zooid with ooecium, suboral and adventitious avicularia. G. Group of ovicellate zooids in older part of colony. H. Distal view of ovicellate zooids, showing suboral and adventitious avicularia. I. Interior of frontal shield, showing ring scar and areolae. J. Internal view of orifice, showing slightly curved proximal margin and hardly recognisible condyles. K. Lateral view of basal colony surface with numerous protuberances. L. Frontal shield interior, showing ring scar and exterior wall microstructure of umbonuloid component. M. Zooidal lateral wall with mural pore chambers. Scale bars: A, K, 500 μm; B, D, E, G, 250 μm; C, F, I, J, 100 μm; H, M, 200 μm; L, 50 μm.