Figure 5
From: Subdivision of arthropod cap-n-collar expression domains is restricted to Mandibulata
Inferred evolution of cap-n-collar and Deformed in Arthropoda. Known expression patterns of cnc (red) and Dfd (green) from panarthropods suggest restriction of a robust Dfd domain to within an anterior tagma in the ancestor of Arthropoda. Hashed bars for myriapods indicate weak expression of Dfd in the trunk segments of the millipede (but not the centipede). Whereas cnc expression occurs throughout the developing chelicerate embryo, disjunct domains of cnc expression are exclusive to the mandibulates, thereby constituting a putative mandibulate synapomorphy. Hashed bars in the posterior terminus for hexapods indicate presence of cnc in the posterior segments of some insects. ch, chelicera; fa, frontal appendage; jw, jaw; sp, slime papillae; L, leg; lb, labrum; mn, mandible; mx, maxilla.