Dicellophilus carniolensis, selection of micrographs of transverse sections through the head from anterior to posterior. A Section through anterior head part in front of the mandibulo-tentorial complex, highlighting muscles arising from the clypeus B Section through the mandibulo-tentorial complex (left side of head) slightly anterior to C; in the inset (scale: 25 µm) the area of flexibility (arrow) between mandibular gnathal lobe and base is magnified. C Section through the mandibulo-tentorial complex (right side of head) at the level of the cuticular tendon (arrow in inset; scale: 25 µm) of the mandibular gnathal lobe. D Section through posterior part of tentorium and mandible (left side of head), showing collagenous tendon system and mandibular septum. Numbers refer to muscles as listed in Table 1. Abbreviations: br brain cl-ecr clypeo-epricranial muscle cl-ep clypeo-epipharyngeal muscle cl-lbr clypeo-labral muscle ct collagenous tendon, ecr epicranium hb hypopharyngeal bar of tentorium lbs labral sidepiece mb mandibular base md mandible mgl mandibular gnathal lobe, mxI first maxilla ph pharynx pp posterior process of tentorium, se septum of mandibular gnathal pouch sma supramandibular arch of tentorium st stilus tb transverse bar of tentorium tmxII telopodite of second maxilla.