Additional file 2.

Linear statistics of gill geometry of Vetulicola. (A-E) Linear regression of gill pouch width on gill slit diameter (gills 1 to 5, respectively), measured from 130 well-preserved gills in 37 specimens of Vetulicola rectangulata (data source: Additional file 3) using PAST software [59], showing the correlation between gill slit diameter and gill pouch width (r: correlation coefficiency).

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Ou et al. BMC Biology 2012 10:81   doi:10.1186/1741-7007-10-81