Figure 1 in Ancestrular morphology in cyclostome bryozoans and the quest for phylogenetically informative skeletal characters

Figure 1. Cyclostome protoecia with interior-walled calcification. Disporella hispida, Stoke Point, Devon, UK. (a) Protoecium with narrow band of exterior wall surrounding an area of pustulose interior wall. (b) Crenulated ridge separating exterior- and interior-walled calcification of another protoecium. Hornera?robusta, Otago Shelf, NZ. (c) Juvenile colony with new zooids formed directly on the ancestrular surface. (d–f) Protoecium of irregularly porous, pustulose interior-walled calcification with erect distal ancestrular tube. Scale bars: 100 µm, except (e) which is 50 µm.