Fig. 2

Myoanatomy of metamorphosing larvae of Wirenia argentea (Neomeniomorpha). Apical faces up in (a)-(e). For better visualization of individual muscular elements, the outer dorsoventral musculature is not depicted in panels (b)-(e) and only the ventral or dorsal half of the larva with section plane in the region of the enrolling muscle is shown in (c) and (e), respectively. Major muscle units are indicated by color code. d is a maximum intensity projection of a confocal image stack. a 3D reconstruction based on confocal microscopy data. Sagittal view shows left half of larval muscle system. All major muscle units are depicted. Note the seven-fold arrangement of the inner dorsoventral musculature and the multiple arrangement of outer dorsoventral musculature. b Schematic sagittal view shows left half of the larval musculature and corresponds to the 3D model in (a). c Schematic representation of the dorsal muscle system seen from ventral. d Scan in dorsal aspect. The red arrow indicates the point of bifurcation of the rectus muscle. e Schematic representation of the ventral muscle system seen from dorsal. f Schematic cross section indicates the relative position of individual muscular elements to each other. Scale bar: 50 μm