The mouthparts of Scutigerella immaculata: Correspondences and variation among serially homologous head appendages.

Descriptions of the skeletomuscular system of the symphylan head are characterized by a high number of incongruencies among authors. The increased accuracy and transparency of 3D-reconstruction methods allows for an allocation of some of the incongruencies to (i) misinterpretations of literature descriptions, or (ii) different views of what constitutes a separate muscle. A structural comparison allows to homologize muscles among the serially arranged mouthparts of Symphyla.