Fig. 14 in The metatrochophore of a deep-sea hydrothermal vent vestimentiferan (Polychaeta: Siboglinidae)

Fig. 14 Series of ultrathin sections through blind-ending coelomic duct adjacent to foregut (fg) from posterior to anterior in first segment in specimen #308. a Basal portion of coelomic duct with cilia (ci) built by two ciliated mesodermal cells m1 and m2 with nuclei (nm1, nm2); b larger duct with cilia (ci) surrounded by mesodermal cells m3 and one of the two ciliated mesodermal cells m2 with nucleus (nm2); c larger duct with cilia (ci) surrounded by mesodermal cells m3 and m4, nucleus of m3 (nm3); d anterior blind-ending of small duct with a few cilia (ci) surrounded by several mesodermal cells (m 4-7) partly with nuclei (nm 5-7)