A graph of Solnhofen pterodactyloids compiled from data available in Wellnhofer [15].

<p>Skull length plotted along the x-axis, wing metacarpal length plotted along the y-axis. Despite clear morphological differences a crowded data set has resulted in all specimens appearing similar. A similar situation is observed when all other elements plotted against skull length. <i>P. antiquus</i> filled circles, <i>P. kochi</i> open squares, <i>Ctenochasma</i> open circles. R² values: all specimens = 0.931; <i>P. antiquus</i> specimens = 0.998; <i>P. kochi</i> specimens = 0.959; <i>Ctenochasma gracile</i> + <i>P. elegans</i> ( = <i>Ctenochasma elegans</i>) = 0.942. Dashed lines are regression lines for each respective taxon, the solid line is the regression line for all specimens.