Fig. 6 in On Powellithecidae fam. nov., a new Pliocene to Recent bryozoan family endemic to New Zealand, with the description of Powellitheca gen. nov. (Bryozoa, Cheilostomata)

Fig. 6. Powellitheca waipukurensis (Waters, 1887) comb. nov. Nukumaruan, Pleistocene, Nukumaru Limestone, Waiinu Beach. A–F. NHMUK BZ 7744. A. General view of two colonies encrusting a bivalve shell. B. Fusion of the two colonies shown in A and formation of kenozooids along the encountering edge. C. Group of fertile zooids and autozooids. D. Ancestrula and early ontogeny. E. Close-up of the minimally calcified ancestrula. F. Autozooidal orifice and avicularium. — G–H. NHMUK BZ 7745. G. Internal view of the proximal, convex, orificial rim lacking a lyrula. H. Multiporous septula on the zooidal vertical walls. Scale bars: A = 1 mm; B = 500 µm; C–D = 200 µm; E–F = 100 µm; G–H = 20 µm.