Fig. 11From: Does the frontal sensory organ in adults of the hoplonemertean Quasitetrastemma stimpsoni originate from the larval apical organ?Distribution of larval types and frontal organs among major nemertean clades. Left: phylogenetic relationships among major nemertean clades (phylogeny modified after Andrade et al. [51] and Kvist et al. [52]). Red rectangles mark synapomorphies. Right: nemertean larvae (apical organs are marked with green) and heads of adult worms (hoplonemertean frontal organ is marked with green; heteronemertean frontal organ is marked with blue)Back to article page