Figure 7.

Schematic overview of head muscle development and summary of results presented in Figures 2-5. aGonodactylaceus falcatus, bNeocaridina heteropoda, cProcambarus fallax f. virginalis, dNeomysis integer, eParhyale hawaiensis. The specified semaphoronts (roman numbers) are shown as simplified drawings containing the optic lobes and anterior six hemisegments of the left body half. Muscle precursors are color coded. The color code is shown at the bottom of the figure. Lateral or medial extrinsic precursors of one segment are numbered in the order they are positioned from anterior to posterior. Abbreviations: Gf (I-IV), Nh (I-V), Pf (I-IV), Ni (I-V), Ph (I-V) species- and semaphoront affiliation; Ol optic lobes, A1, A2, Md, Mx1, Mx2, T1 appendage anlagen, FS developmental event: full set of segment anlagen present, intrinsic appendage muscle precursors are marked by asterisks.