Fig. 4
Maxilla 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 of 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, mx – maxilla, v – ventral