Additional file 1.
Gill structures of Vetulicola rectangulata from Yunnan, China. (A,B) Laterally preserved specimens ELEL-SJ101975A and ELEL-EJ080158A, respectively. (C,D) Close-up images of the boxed area in (A) and interpretative camera lucida drawing, respectively, showing gill openings, lateral groove, groove floor, Y-shaped medial gutters, transverse ridge posterior of the gill pore, lappets, and their spatial arrangement relative to the adjacent plates. (E,F) Close-up images of boxed area in (B) and interpretative camera lucida drawing, respectively, showing dilated lateral groove, groove floor, Y-shaped medial gutters, gill openings, lappets, and their spatial relationship. Abbreviations: Cz, concentric zone that surrounds the gill opening; G1-5, gills 1 to 5; Go, gill opening; La, lappet; Po, gill pouch; Rg, ridge; Se, sediment fill; Tf, trace fossil (unconnected to specimen); Tr, trough; Ys, Y-shaped structure. Scale bars: 1 cm in (A), (B); 5 mm in (C) to (F).
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Ou et al. BMC Biology 2012 10:81 doi:10.1186/1741-7007-10-81