FIGURE 4. Calyptotheca alexandriensis n in A new species of Calyptotheca (Bryozoa: Cheilostomata) from Alexandria, Egypt, southeastern Mediterranean

FIGURE 4. Calyptotheca alexandriensis n. sp., scanning electron micrographs of the paratype, NHMUK 2016.12.22.1; A–D are of a bleached fragment, E and F of an unbleached fragment. A, group of zooids, some with complete ovicells, others with undeveloped ovicells, and some with orifices covered by closure plates. B, zooid with an undeveloped ovicell and a closure plate between two zooids with complete ovicells. C, oblique view of growing edge showing septulae in transverse vertical walls. D, primary orifice, condyles and suboral avicularium in a zooid viewed obliquely. E, zooid with in-situ operculum and a partly formed ovicell showing the floor of the entooecium. F, oblique view to show the in-situ mandible of a suboral avicularium. Scale bars: A, C = 500 µm; B = 200 µm; D–F = 100 µm.