Ontogenetic trends in canal diameter and neuromast size (length, width) in SO and MD canals. A-C) Comparison of rates of increase in three variables: canal diameter (A), neuromast length (B) and neuromast width (C) in Tramitichromis. D-F) Comparison of rates of increase in three variables: canal diameter (D), neuromast length (E) and neuromast width (F) in Aulonocara derived from histological material. See Tables 2 and 4 for statistical analysis. P <0.05 = significant; N.S. = no significant difference in rate of increase in neuromast size between supraorbital (SO) and mandibular (MD) canals.