Fig. 3

Mandible and head capsule of Pyrrhosoma nymphula. a-d Three-dimensional visualisation from SRμCT data e-g. Sketch of the hypothetical function of the musculature – grey muscle-pictograms or parts of those indicates internal position within the respective mouthpart, grey additional outlines indicates membranous areas, lengths and broken lines are uninformative a. head capsule with labrum, fronto-lateral view b, e. Frontal view c, f. Lateral view d, g. Dorsal view. Abbreviations: c – caudal, d – dorsal, f – frontal, hc – head capsule, l – lateral, md – mandible, v – ventral