Figure 6 in Systematics of the Miocene-Recent bryozoan genus Pentapora (Cheilostomata)

Figure 6. Pentapora fascialis (Pallas, 1766), scanning electron micrographs of uncoated fossil specimens imaged using backscattered electrons. A–C, Lower Pleistocene, Arda stream, Castell'Arquato, Piacenza, Emilia, Italy, NHM BZ 5669. A, colony fragment showing zooids with normal and giant avicularia, and ovicells overgrown by secondary calcification. B, giant avicularium in autozooid having primary orifice almost obscured by lappets forming a bridge. C, ovicell. D–F, Pliocene, Emilian, Gillina, Calabria, Italy. D, E, NHM BZ 5664. D, autozooids, showing normal avicularia and a giant avicularium, and a broken ovicell. E, ovicell. F, NHM BZ 5667. bases of oral spines (arrows). Scale bars: A = 300 Mm; B = 150 Mm; C, E = 120 Mm; D = 200 Mm; F = 110 Mm.