Figure 11 in Systematics of the Miocene-Recent bryozoan genus Pentapora (Cheilostomata)

Figure 11. Pentapora clipeus sp. nov., scanning electron micrographs of uncoated specimens from the Middle Pliocene of Monte Padova, Castell'Arquato, Piacenza, Emilia, Italy, imaged using back-scattered electrons. A–D, holotype, NHM BZ 5662. A, colony fragment with zooids bearing giant avicularia. B, partly overgrown ovicell and two giant avicularia. C, giant avicularium; note the lack of a calcified crossbar. D, giant avicularium with closure plate containing two pores. E, paratype, NHM BZ 5663. E, orifice with left lappet preserved and giant avicularium with closure plate. F, primary orifice, normal suboral avicularium, and median septum and circular muscle impression visible on the basal wall of the broken zooid at the top left. Scale bars: A = 280 Mm; B = 100 Mm; D = 60 Mm; E = 50 Mm; F = 100 Mm.