Additional file 4.

Gill filaments in Vetulicola cuneata from Yunnan, China. (A) Laterally preserved specimen ELI-0000216. (B) Close-up image of the boxed area in (A), displaying tufts of filaments lining the surface of the gill pouch (viewed from the exterior). Transverse, slit-like gill opening denoted by arrowhead. Abbreviations: Fi, filaments; G1-5, gills 1 to 5; La, lappet; M, mouth; T, tail; Tr, trough. 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