Cephalic musculature in five genera of Symphyla (Myriapoda)

► Anatomy of the head of two Scutigerellidae and three Scolopendrellidae (Symphyla). ► Cephalic anatomy of Scolopendrella more similar to Scutigerellidae. ► Mandibular mechanisms in Scolopendrellidae more plesiomorphic than Scutigerellidae.