Figure 1 in Rhynchocoel vessel in Cephalotrichidae (Nemertea: Palaeonemertea)

Figure 1. Transverse sections to show the rhynchocoel vessel (indicated by an arrowhead) in cephalotrichids. (A) Cephalothrix adriatica Senz, 1993 (holotype, NHMW-EV 3236); (B) Cephalothrix hongkongiensis Sundberg et al., 2003 (holotype of Procephalothrix arenarius Gibson, 1990, BMNH 1987.2.27); (C) Cephalothrix kefersteini Senz, 2000 (holotype, NHMW-EV 4040); (D) Cephalothrix oestrymnica (Gibson, 1991) (holotype of Procephalothrix oestrymnica Gibson, 1991, BMNH 1990.6.2); (E) Cephalothrix orientalis (Gibson, 1990) (holotype of Procephalothrix orientalis Gibson, 1990, BMNH 1987.2.33); (F) Cephalothrix rufifrons (Johnston, 1837) (ZIHU 3510). Scale bars: A, B, C, F = 20 µm; D = 40 µm; E = 100 µm.